Do you have propane at home? It sounds like you might want to look into oxy-propane for cutting and brazing. You could do a lot of what you're talking about by fillet brazing, and propane would work fine for that, easier to transport/store and cheaper. The torch tips should be made for propane or modified from the acetylene tips.
I thought the rule of thumb was to keep an acetylene bottle upright for twice as long as it had been on it's side before using it.