As for the people telling him to "just" import the car, it is absolutely impossible without DOT and EPA certified crash test data. And that goes for any RHD vehicle. (
click here and read 3rd paragraph ) Hell I tried almost a year to get a J-spec FC3S TII (they were really tempting considering they are like $5500 shipped) over here and it just wasnt worth the hastle. Your only option would be to bring in an S15 as a "parts car" (which you can get into the country with no problems) then transfer everything onto an S14 shell (from a junk yard or what not). The only major modification nessesary (aside from the conversion itself) is to remove the S14 firewall, and try to fit in and weld the S15 firewall (so that everything will match up for the RHD conversion).
In all honesty, you'd probably save money in the long run going this way, if you do all the work yourself.