MCForums:

http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/2310397

GitHub:

https://github.com/da3dsoul/Additional-Buildcraft-Objects

Permission for modification and distribution from original author:

https://github.com/da3dsoul/Additional-Buildcraft-Objects/issues/40

This will not have extensive information about the mod. It is a long standing one and info can be found elsewhere.

I forget stuff exists sometimes, so checking the github is the most reliable source.

Post bugs on MCForums or GitHub if you find any. I prefer github out of convenience (they also email me faster).