umsomtimes wrote:good cheap
That's an oxymoron. Trust me, you'll be much happier if you get it done right so your front bumper lines up and doesn't fall off every other day. By conversion, I assume you are talking front end conversion (no engine). If you are in the market for this (well, you should really do engine work first, but its your car so do as you like) then you are looking at spending around $1000 for a s13 Silvia conversion, $2000 for a kouki s14 conversion or $3000 for a s15 conversion.
Don't be a cheapskate when it comes to body work, it will haunt you forever.