Good job using copper tubes, and i'm pretty sure another good job with the future powder coating. Just remember to put something where the TVP rests on the copper tubes. otherwise you may see a nasty scratch mark on either your TVP or the nicely powder coated stand. Just a suggestion. By the way, were you not happy using a PVC stand, and you just had to build a nice and expensive copper tube stand instead? If you polished it very shiny, you might mistaken it as a trophy from a race you had won.
Overall, I'd say this is a professional tube work.