I vaguely remember O'Neil's book talking about zero g manufacturing by welding together plates of Aluminium. Although I may be remembering some other work. Coul

I vaguely remember O'Neil's book talking about zero g manufacturing by welding together plates of Aluminium. Although I may be remembering some other work. Could we use an inflatable workshop to weld together cylindrical sections of a torus? I can imagine sealing the end of the torus secrion and extruding it out the side of the inflatable. Very hazardous for the workers, I imagine.