The JACPack project Is nothing yet.
Minecraft: 1.4.7
MCP: 7.23
Forge: #534
Get the mentioned Forge and MCP, and decompile (using install.cmd/sh). Once you have a working Forge workspace, pull the repo into that MCP folder. When more than one contributor is online, we use Saros to collaborate.
Message the group if I'm missing people