Welcome and first off please do not attempt to build the Kart yourself. It would in no way be competitive in the field of professional built chassis. There is an art and method to thier madness. There is a certian amount of flex a chassis needs, and corner to corner weight needed for a chassis to work correctly. Its been about 12 years since I owned my own kart, just rent them now. I would get a hold of White chassis, or Margay, or Comet. And talk with them, White was the ticket back in my day. Also find your local track and check the class rules. They are very strict, and mandated to a very specific set up chassis wise and motor wise as well. Maybe even some racer there wanting to update and has thier old kart for sale.