I'd replace the whole support, no guess work on the angle. It definitely takes forever and a day to build one of these. Check out your local hardware store, not lowes or the depot but your local mom and pop store. Should be some brass fittings there to get you hooked up so you can start melting metal. Keep it up, just one step/job at a time and you'll knock it out. Keep in mind every single cut you make or spot you weld is a job. So after you do it you'll think "man I finally got something done", lol. Its a long road, but you can do it!
