Mine ended up being, with the RB 26 in it, a total of 2750 with me not in the car and no gas in the tank. Front to back bias was 51 front 49 rear using the zr200 mounts. Mine was gutted with a stock dash with no heater core, one FRP racing seat and a mild steel 10 point cage. I weighed it using hi tech scales that are calibrated every 90 days that we use at work for weighing aircraft cargo
I would imagine his is about the same plus or minus 100lbs. most of the rb Z's that i have seen were between 2600 and 2900 unless they were put on a serious diet.