Non Rellable 1 lb propane tanks

Just wondering if any of you guys has attempted to repurpose a coleman propane tank - the little 1 lb critters - and have cut one open? What thickness is the sheet metal? I need to make a replacement car tank for an old single cyl engine - Like to make it about 2 liters which would be roughly 11 or 12 inches long with the 3.5 inch diameter tank.

Just cut the bottoms off 2 tanks, cut the gas fittings off the top, tig them together and tig the holes shut and add a filler neck and fuel outlrt boss.

Just want to know how solid the tank would be - how much abuse it would take without getting dented.

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I read that medieval combat helmets made from barbecue propane cylinders dent easily.

Old fire extinguishers are larger.

Look at the lap seam in the middle , that'll tell you how thick . I've used the short fat ones for aluminum crucibles , IIRC they are around 18-20ga give or take . They're actually thicker than the stock most of those small tanks are made of .

In any case they can't be any worse than the sheet metal tanks that come on some power tools.