This kit is typical of late 80's Fujimi releases...
Simplified, a little soft on details, nothing really bad though.
I'm not sure what you are planning, but the F&F Supra chassis might just fit under this body, though the engine compartment is wider on the earler Supra, though I'm not sure it matters in the scale world.
Personally I'd pick up the Tamiya MK III Supra off of Ebay and use the chassis from the Tamiya MK IV Supra. Though it may cost a little more to go that way I'm sure it would be easer, and the results would probaly be better.