I wouldn't suggest drilling the frame connectors cause that'd weaken them. If their the bolt in kind you could build something to bolt in where they do but I doubt anyone builds them because not all frame connectors are alike
build ur own driveshaft loop, make the loop adjustable, wide enough to weld it to ur subframe connectors. (up tite to the floorpan. if done right , u can also bolt 2 of the seat mounts thru it. stronger and stiffer .
