I've tried to install forge for minecraft 1.46 in order to create addons for it. Since there don't seem to be any guides out there, I just experimented a little, and I figured the best thing to do was to install the api in the src folder, get new hashes and then dump the rest of the mod in the mods folder. I installed forge (6.5.0.471) and mcp (7.25). With no mods in my mod folder, the game runs just fine. However when I add industrialcraft it crashes at start. I haven't yet installed the api so that isn't what's causing it
Here's a the log http://pastebin.com/bFjbitLy