With #2 tip, the typical, medium duty Victor 100FC handle weighs over a pound - or about the same as a full cup of coffee in a heavy, ceramic mug. The Victor J-28 w/tip is about 11 oz. Now add (approx) 8 more ounces of heavier (and stiffer), 1/4" hoses to your 100FC. Brazing a straight, 60 second butt joint on a welding table is one thing, torching half-a-dozen, precision, 360 degree, tight radiuses (one right after the other), is quite another. Sure it can be done, and is done, but by the fifth or sixth frame, it gets really old... really fast.

Assembling a quality OA framebuilding setup piecemeal can be expensive, to be sure. But it only needs to be done ONCE.