I was mostly wondering which one I should use: the ol' v3, or the latest one for the main IC2 branch?
GT6 doesnt have reactor components for ic2 sooooo, why do you want that?
...To be honest, I'm big on planning. So I was planning according to what I know of GregTech - which, to be honest, dates back to FTB Ultimate.
But hey, that's also an answer. Most recent one it is.