rx7>rx8

Hello all, recently acquired a tig welder and i remember someone posting diagrams on how to modify your subframe for a 2jz swap. While im sure tech 2's setup is the easiest and most userfriendly to use, I'm going to take the DIY approach and do it all myself. I've heard of people just slotting the holes on their subframes to fit the engine, does anyone have any experience with that? like to keep the engine low and far back while still being able to keep my A/C. Thanks everyone.