nice! i was looking for a 22b model but couldnt find one, so I thought about doing something like that as well sometime in the distant future. Your main concern will be to find/modify a different STI interior to match the 22b. The badge on the back you can either paint or photoetch or even just carve out of a small piece of styrene. Also, dont forget the 22b never came with a stereo so you will have to remove all traces of that if you want to retain authenticity. Lastly, you will have to find some 17in BBS rims and paint them in the same golden colour as the STi, as those were the specially made rims for the 22b.
dont forget the interior is two tone, black with blue inserts!
hope this helps a bit
-Seb