Cool setup. Don't be offended, but I wanted to make sure those nitrous bottles will actually feed nitrous to the engine.
Other wise I like the car. It's very clean and the suspension work you've done is good. I'd like to see some slightly better detailed brakes, not saying full lines and fittings are necessary, but those rotors and calipers look pretty non-descript.
As for the interior, the color scheme you originally hit upon would've looked good (red and black would have been my choice, if you care to know) but the driver's seat you've chosen is not going to cut it on a detailed model. Quite frankly, the molded in harnesses need to be removed and the shape looks entirely out of place next to the stock passenger's seat. Basically, between the sound system and the nitrous, you've really turned it into more of a boulevard car as opposed to a weekend warrior. I'd really suggest tracking down some heavily bolstered Recaro style seats to take the place of the pair in the interior right now.
Perry's Resin carries this line of resin seats for $5 a pair. Surely they'll do better than AMT Supra toss offs, right?