get yourself the front subframe off a S15, The Engine, tranny, driveshaft, brakes, suspension.....everything..... put that on your S14.
Take the rear subframe from a S15 and put it on the S14, I hear it fits ok on a s13 but requires some customization on the s14 as the 14 is the widest S chassis car. Use the rear suspension(supposed to stiffen up the rear a lot vs prior models) brakes, Diffrential, axels, spindles.
This takes care of the mechanical shit, then you need to cut off some weight off that heavy ass s14 pig...
I don't think you could ever make the rear look like a S15. The dimensions are totally different and different angles. Even with tons of money it still wouldn't look the same. If you sat down with the best body shop guy with a million dollar budget, I bet he could replicate the S15 for you, this would require money, tools, expertise.... not all shops have the required tools and expertise for something like that. This isn't bondo-ing on some R33 tail lights on a Prelude
