Our car weighed in at 1828 as a fully driving go-kart (no driver) on Longacre scales at EFI Logics. We also had the windshield, carbon canister (now removed from the car), etc. Basically, we were just missing the fiberglass panels, headlights, and tail lights.

Additional weight came from:
We had about 60lbs of fuel more than you, since our tank was close to full (estimating a full tank weighs about 90lbs)
AWIC system, which took a little over 2 gallons of water (~17lbs), plus the weight of the hoses, awic radiator, and the core (20lbs?)
I imagine your Kirkey's are a little lighter than our Sparco seats.
Our 25lb turbo

Combined that's around 100lbs or so of extra weight that our car has compared to yours.

How much do you think the panels, headlights, and tail lights weigh? I was thinking 200lbs, but maybe that estimate is high. We haven't weighed ours since it was completed. Now I'm curious!