I had ERA bond the body to the frame & did most everything else myself. With Very few options & doing most of the work yourself on a small block car you could be under 35k. Paint, Pin drive set up, big brakes, ERA rear, professional engine build, high end paint, etc etc etc will quickly throw you out of that range. I'm in the 45k range with mine because I wanted quite a few extras
. The ERA Assembly guide is well written. If you have the proper tools & follow the instructions, you'll be ok. Luckily for anyone taking on a Cobra Project, this site exists. If you have any questions there is someone here with the answer.