A HUGE limiting factor in your situation is the tyres you want to run. I suggest getting some smaller tyres for them. As for the offset, you can fit -10 under B110 front gaurds pretty easy if you use the right tyres and get rid of the factory positive camber. The B310 (210) has much bigger gaurds so you should be able to swallow that up pretty easily. Fit a wheel and do some measurements to get the best information
Not so much a bodykit as such, you can still get a hold of the TS Cup style flares, front bar and bobtail from Pitroad, Japan. And yes you can still get a hold of the Tomei rocker covers and engine parts, Yahoo auctions sometimes has a Tomei cover on it but be prepared to lay down some serious coin to acquire one. The flares, bar and bobtail aren't exactly the cheapest either considering the amount you will pay for postage.
It's all out there and relatively easy to acquire, if you have the money.