Carman34L hit it on the nail, the welding isn't difficult, its all the prep work that takes time, the cutting and grinding, making sure everything is flush, level and square. Making the actual welds is easy though. Check out one of the metal yards in Houston, Im sure a few will do fabrication for you, or know of a guy looking to make some extra bucks.
It costed me about $1,200 to get started with equipment for welding basic projects, a lincon mig machine, a rigid chop saw, a rigid drill press, and a couple hand grinders, plus an electric welding helmet.
But I saved a ton building my DIY huge parrot cage instead of purchasing one, saved enough to have a whole pike of new tools. I even have been tinkering around with fabricating some steel pump bases with the scrap metal around the house.