Jeez, I've built alot of frames but feel it would be diffecult to make a handlebar. You would have to put something inside the tubing so it wouldn't kink and still get it out. For simple bends, I use packed sand or a spring but a handlebar has alot of bends, also if it's aluninium, you have to heat it to bend, then heattreat it back to hardness. I have lugs you can have to try and build a frame, my lugs are for gluing the joints together so no welding needed.