Welcome.
If you are a serious builder, this will be interesting to watch. From the tone of your posts, I'd say you're trying to be funny, so I'll venture a 10% chance that you'll get it finished. Hope you'll prove me wrong.
As to your choice of round chrome moly tubing, you may want to do some more research. You mention the need for practice projects, so I guess you haven't welded a chrome moly tube frame yet. Nothing wrong with it, but you are stepping up a fair bit: higher cost and the need to TIG, which requires more precise coping and fitting. Tigging a frame is very time consuming, and requires a lot of out of position welding. You will not gain much in weight savings, because chrome moly only has an advantage when you can reduce the wall thickness over mild steel; but, most Locost frames are already done in 16ga (0.065"). You will end up with a very stiff frame, if done in chrome moly, and if your plans include racing, there maybe a benefit there. A round tubing frame also poses some extra fabricating steps, since it is more difficult to mount the body panels and floor. All of it can, and has been, done. It is a great adventure, just don't underestimate it.
BTW, I built the airplane first and the car second. The airplane was easier.