Now you got me thinking...
Drive that thing over a scale if you can. I remember pulling out all of my seats, it's that little stuff that adds up once i had a big pile of parts.
You look like you got it pretty well stripped down, just make sure the gas tank is about 1/8 full, lose the battery and just take a jump start LOL.
How is your fan wired up? Not for weight but for power, do you run a low pressure fan clutch at the track? I know my heavy duty job sounds like a piece of farm equipment and has to be robbing me of some power.