I picked up a
Harbor Freight tubing roller:
It does a real nice job on 1" stainless tubing. I've gotten down to 8" or so bend radius with no kinking. (It could go tighter, but I had no need to do so.) A trick is to be rolling the tube as you crank down the upper roller to prevent a dimple on the tube surface.
If you don't have a TIG welder, you can bend up and notch the ends of the tubes where welds are needed, and pay someone to do the welding. If you can get away with standard fittings you can avoid welding:
For tubing, try different chandleries. I've found a 2 to 1 difference in price between different marine stores.
Good luck,
Tim