I was just reading about the weight of the chassis, about 100 lbs or something? How much does the finished car weigh?

Hmmmm. How long is a piece of string?
Depending on which way your build is going to go, anything between 400 and 700kg. Are you using a motorbike or car engine? Is it going to be completely ali panelled or steel? Stripped out racer or carpets and windscreen? Live axle or IRS?
Even with these questions answered you could only take a guess. Unfortunately, there are too many variables......

as a guide, between 500 and 700 kilos - most end up around 650


atb

steve