I have a carbon fiber front end, glass hood, aluminum rims, rear roll pan. Everything else is stock and the truck was about 3300 lbs with me in it (Im a svelt 160).

Full out race like you said with lexan, more fiberglass parts, no interior, no dash, no AC/PS/PB, aluminum radiator, not stock steering wheel, I bet you could get it to be 2800 lbs + driver (not tube chassis, front or back-halved.