Dear John,
Fujimi did indeed make a 1/25 scale kit of the 325 back in the late-eighties. I don't know what year body it was because right now mine is in deep storage, but all of the E-30 body styles are the same (except for the M3's bulgy fenders and aero add-ons). Taillights vary however and so do front air dams. I do remember that ithe kit is the 2-door hard top version and I think the taillights are the ones with the single recessed groove bisecting the lens horizontally. Get thee to eBay I guess...
The Boy