First off you said you could make it for X amount of dollars, then you complained that you could not find extrusions that you could epoxy steel tube into, I gave you some choices did not say you had to have your own extrusions made but what is possible
So why do you keep looking at the same kind of junk !! build your own most people can do better than what you can buy the cheap junk for figure out a design type you want and go for it