Glad you like it. I'll look into Gogs of the Machine at some point, as for BTW, it never updated (and is incompatible with Forge) so it most likely will never happen. Harvestcraft would be nice, but it is currently incompatible with TFC. Tinkers construct... maybe.
I have also looked into Tinkers Construct but turned it down since you need to put lava into the smeltery for it to work.