I think you would be better off spending a little more on something more modern and race ready. By the time you end up getting that kart ready to hit the track you'll probably spend more then getting something turnkey. Just my 2 cents though.
I'm generally pretty optomistic . They are probably right .
Brakes work ? 200.00
no nerf bar . unavalible .custom fabrication 200.00
new tires 250.00
seat fit ? 180.00