i dont cut up my porfane tanks i refill them , got a 20lb tank with a adapter on it . cheaper way to use the torch :thumbsup: that and a great way to use up that 20 lb'er the packing nut leaks when open :censure:
the tanks are made out of some heavy duty hydro filter shells ,with a tin lining in them . about the same way you did yours but with the seam reinforced on the inside and tinned to stop them from rusting . with a 1/8 pipe bung soldered to the bottom for the pet cock .