IRS help

Hi
for my other toyota i cant decide weather or not to go irs or 4link. i already have a complete IRS setup lieing around just i need some qs answered before deciding.

ok the irs is out of a 260Z. the track width is slightly to narrow so does is it realistic to maybe build a new crossmember that sets the arms further apart and is it possible to get new irs driveshafts made that are longer?

or will stretching the track stuff up all the facotry considered geometry?

also the 260z hub is the larger 4stud and i need toyota 5stud there, anyone know off hand is a 300zx hub or something is a straight swap for these or can i get the stock rotar.hub redrilled by a machine shop?

also what sort of major considerations do i have to think about while installing a irs on bag setup? i have a fair grasp of a solid diff and 4link but no idea about irs geometry.

thanks a lot if anyone can help me out

just use adapters, fixes your lug pattern and track width. that would be the simplest solution.