S15 front on an R32 looks like arse, the S15 face demands a smooth back with curves, ie a S15 or a 180sx. An S15 front on an R32 looks like a S15 front on a S13 silvia with round taillights. The R32 demands a chunky front, to match the chunky butt. Even the S15 front on an S14 is kinda borderline for me, it works only because the s14's kinda rounded at the back.
There's a yellow S13 silvia in the US with an S15 front and Skyline tail lights grafted onto it. Looks like a steaming pile of shit.
For an R32 you want something butch... why not try a DTM style mercedes, audi or BMW front? Panels are readily available locally, they'll fit the lines of the R32 and it'll be quite different. If you wanna be REAL cheeky, grab a VE commodore frontend and graft it on. VE's look tough as fron the front.