diff --git a/Prototyping/.vscode/launch.json b/Prototyping/.vscode/launch.json
new file mode 100644
index 0000000..b1330a3
--- /dev/null
+++ b/Prototyping/.vscode/launch.json
@@ -0,0 +1,21 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            //https://businesscentral.dynamics.com/2384b7c3-109e-4c22-8731-4394fb3aa627/QA_Feature?company=PrintVis%20Inc.&page=2500&dc=0&bookmark=18_zpQ1dwCRhyKkVlN-IUu7elgqmuaGXA
+            //https://businesscentral.dynamics.com/2384b7c3-109e-4c22-8731-4394fb3aa627/JH-Test
+            "name": "Microsoft cloud sandbox",
+            "request": "launch",
+            "type": "al",
+            "environmentType": "Sandbox",
+            "environmentName": "JH-Test",
+            "tenant": "2384b7c3-109e-4c22-8731-4394fb3aa627",
+            "startupObjectId": 22,
+            "startupObjectType": "Page",
+            "breakOnError": "All",
+            "launchBrowser": true,
+            "enableLongRunningSqlStatements": true,
+            "enableSqlInformationDebugger": true
+        }
+    ]
+}
\ No newline at end of file
diff --git a/Prototyping/PVSJobItemMinReelWidth.Codeunit.al b/Prototyping/PVSJobItemMinReelWidth.Codeunit.al
new file mode 100644
index 0000000..21e5b22
--- /dev/null
+++ b/Prototyping/PVSJobItemMinReelWidth.Codeunit.al
@@ -0,0 +1,67 @@
+codeunit 50103 "PVS Job Item Min Reel Width"
+{
+    [EventSubscriber(ObjectType::Table, Database::"PVS Job Item", 'OnAfterValidateEvent', 'Final Format Code', false, false)]
+    local procedure OnAfterValidateFormatCode(var Rec: Record "PVS Job Item"; var xRec: Record "PVS Job Item")
+    begin
+        CalcMinReelWidth(Rec);
+    end;
+
+    [EventSubscriber(ObjectType::Table, Database::"PVS Job Item", 'OnAfterValidateEvent', 'Controlling Sheet Unit', false, false)]
+    local procedure OnAfterValidateControllingSheetUnit(var Rec: Record "PVS Job Item"; var xRec: Record "PVS Job Item")
+    begin
+        CalcMinReelWidth(Rec);
+    end;
+
+    [EventSubscriber(ObjectType::Table, Database::"PVS Job Item", 'OnAfterValidateEvent', 'Imposition Type', false, false)]
+    local procedure OnAfterValidateImpositionType(var Rec: Record "PVS Job Item"; var xRec: Record "PVS Job Item")
+    begin
+        CalcMinReelWidth(Rec);
+    end;
+
+    [EventSubscriber(ObjectType::Table, Database::"PVS Job Item", 'OnAfterValidateEvent', 'Front Overfold', false, false)]
+    local procedure OnAfterValidateFrontOverfold(var Rec: Record "PVS Job Item"; var xRec: Record "PVS Job Item")
+    begin
+        CalcMinReelWidth(Rec);
+    end;
+
+    local procedure CalcMinReelWidth(var Rec: Record "PVS Job Item")
+    var
+        ImpositionRec: Record "PVS Imposition Code";
+        Guard: Codeunit "PVS Min Reel Width Guard";
+        LeavesWidth: Decimal;
+    begin
+        if Guard.IsCalcInProgress() then
+            exit;
+
+        if not ComponentTypeIsInside(Rec."Component Type") then
+            exit;
+
+        Rec.CalcFields("Controlling Sheet Unit");
+        if (Rec."Final Format Code" = '') or (Rec."Controlling Sheet Unit" = '') or (Rec."Imposition Type" = '') then
+            exit;
+
+        if not ImpositionRec.Get(Rec."Imposition Type") then
+            exit;
+
+        LeavesWidth := ImpositionRec."Leaves Width";
+
+        Guard.SetCalcInProgress(true);
+        if TryApplyMinReelWidth(Rec, LeavesWidth) then; // errors silenced; execution always reaches the next line
+        Guard.SetCalcInProgress(false);
+    end;
+
+    [TryFunction]
+    local procedure TryApplyMinReelWidth(var Rec: Record "PVS Job Item"; LeavesWidth: Decimal)
+    begin
+        // Direct assignment does not fire OnValidate; no recursion risk here
+        Rec."Minimum Reel Width" :=
+            (LeavesWidth * Rec.Width) +
+            ((LeavesWidth / 2) * (Rec."Front Overfold" + Rec."Milling Depth"));
+    end;
+
+    local procedure ComponentTypeIsInside(ComponentType: Code[10]): Boolean
+    begin
+        // Matches component types whose code contains 'INSIDE', consistent with the '*INSIDE*' filter in the spec
+        exit(StrPos(UpperCase(ComponentType), 'INSIDE') > 0);
+    end;
+}
diff --git a/Prototyping/PVSJobItemMinReelWidth.TableExt.al b/Prototyping/PVSJobItemMinReelWidth.TableExt.al
new file mode 100644
index 0000000..c57aa49
--- /dev/null
+++ b/Prototyping/PVSJobItemMinReelWidth.TableExt.al
@@ -0,0 +1,26 @@
+tableextension 50100 "PVS Job Item Min Reel Width" extends "PVS Job Item"
+{
+    fields
+    {
+        field(50100; "Minimum Reel Width"; Decimal)
+        {
+            Caption = 'Minimum Reel Width';
+            DataClassification = CustomerContent;
+            ToolTip = 'Minimum Reel Width in mm';
+
+            trigger OnValidate()
+            var
+                Diff: Decimal;
+                Guard: Codeunit "PVS Min Reel Width Guard";
+            begin
+                if Guard.IsCalcInProgress() then
+                    exit;
+                // xRec holds the pre-validate value; Diff is 0 when unchanged (e.g. first-time insert)
+                Diff := Rec."Minimum Reel Width" - xRec."Minimum Reel Width";
+                if (Diff <> 0) and (xRec."Minimum Reel Width" <> 0) then
+                    // Per spec: the difference (new - old) is added 1:1 to Front Overfold
+                    Rec."Front Overfold" := Rec."Front Overfold" + Diff;
+            end;
+        }
+    }
+}
diff --git a/Prototyping/PVSJobItemsListPart.PageExt.al b/Prototyping/PVSJobItemsListPart.PageExt.al
new file mode 100644
index 0000000..7baefb9
--- /dev/null
+++ b/Prototyping/PVSJobItemsListPart.PageExt.al
@@ -0,0 +1,15 @@
+pageextension 50101 "PVS Job Items ListPart Ext" extends "PVS Job Items ListPart"
+{
+    layout
+    {
+        addafter(ImpositionType)
+        {
+            field("Minimum Reel Width"; Rec."Minimum Reel Width")
+            {
+                ApplicationArea = All;
+                Caption = 'Minimum Reel Width';
+                ToolTip = 'Minimum Reel Width in mm';
+            }
+        }
+    }
+}
diff --git a/Prototyping/PVSMinReelWidthGuard.Codeunit.al b/Prototyping/PVSMinReelWidthGuard.Codeunit.al
new file mode 100644
index 0000000..60586a1
--- /dev/null
+++ b/Prototyping/PVSMinReelWidthGuard.Codeunit.al
@@ -0,0 +1,17 @@
+codeunit 50101 "PVS Min Reel Width Guard"
+{
+    SingleInstance = true;
+
+    var
+        CalcInProgress: Boolean;
+
+    procedure SetCalcInProgress(Value: Boolean)
+    begin
+        CalcInProgress := Value;
+    end;
+
+    procedure IsCalcInProgress(): Boolean
+    begin
+        exit(CalcInProgress);
+    end;
+}
diff --git a/Prototyping/Thirsday25App.code-workspace b/Prototyping/Thirsday25App.code-workspace
new file mode 100644
index 0000000..e3e2fed
--- /dev/null
+++ b/Prototyping/Thirsday25App.code-workspace
@@ -0,0 +1,10 @@
+{
+  "folders": [
+    {
+      "path": "Thirsday25App"
+    }
+  ],
+  "settings": {
+    "al.enableCodeAnalysis": false
+  }
+}
diff --git a/Prototyping/Thirsday25App/app.json b/Prototyping/Thirsday25App/app.json
new file mode 100644
index 0000000..155b24c
--- /dev/null
+++ b/Prototyping/Thirsday25App/app.json
@@ -0,0 +1,39 @@
+{
+  "id": "2d9f26a9-f8e2-4695-9dc7-16f8ad2b28fe",
+  "name": "Thirsday25 app",
+  "publisher": "PrintVis",
+  "version": "1.0.0.0",
+  "brief": "",
+  "description": "",
+  "privacyStatement": "",
+  "EULA": "",
+  "help": "",
+  "url": "",
+  "logo": "",
+  "dependencies": [
+    {
+      "id": "5452f323-059e-499a-9753-5d2c07eef904",
+      "name": "PrintVis",
+      "publisher": "PrintVis A/S",
+      "version": "28.0.0.0"
+    }
+  ],
+  "screenshots": [],
+  "platform": "1.0.0.0",
+  "application": "28.0.0.0",
+  "idRanges": [
+    {
+      "from": 51000,
+      "to": 51999
+    }
+  ],
+  "resourceExposurePolicy": {
+    "allowDebugging": true,
+    "allowDownloadingSource": true,
+    "includeSourceInSymbolFile": true
+  },
+  "runtime": "16.0",
+  "features": [
+    "NoImplicitWith"
+  ]
+}
\ No newline at end of file
diff --git a/Prototyping/Thirsday25App/src/THRThursday25Install.Codeunit.al b/Prototyping/Thirsday25App/src/THRThursday25Install.Codeunit.al
new file mode 100644
index 0000000..eea6e68
--- /dev/null
+++ b/Prototyping/Thirsday25App/src/THRThursday25Install.Codeunit.al
@@ -0,0 +1,8 @@
+codeunit 50102 "THR Thursday25 Install"
+{
+    Subtype = Install;
+
+    trigger OnInstallAppPerCompany()
+    begin
+    end;
+}