yes, i've searched quite a bit, both here and on f-a. i'm actually really surprised that i couldn't find much useful info, since this is not too uncommon.
so basically, i want to use 300ZX Twin Turbo wheels on my S13. theoretically, they should fit perfectly, clearing the very wide 4-piston brakes of the skyline and 300zx (only the 11" and 11.6" ones though), as well as at least stock suspension if not coilovers. i would guess they'd stick out a little as the S13 doesn't have fenders as wide as S14, and the Z32 wheels are a bit wide. but they're perfect for me; 16" keeps tire costs down a bit, as well as weight, and 7.5" wide front and 8.5" wide rear are perfect widths.
it's just hard to find wheels that fit this car well, since it needs somewhat lower offsets and they need to be wider than most cheap ricebag wheels. i've seen a few people on here rocking them (SR Smith please respond!), so please let me know how they fit. i'm thinking i'll hit the junkyard here soon and get the rear hubs from an NA and a pair of turbo rear wheels before i need rear tires AGAIN, so at least i'm buying tires for the new wheels, then get the front wheels and 5-lug conversion later.
