What about stainless?
Not sure about alloy, but I know stainless can be welded with a stick welder, its what i'll be doing mine with.
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I recently purchased a Camec plastic water tank to install under my dormobile, but it's too big to fit where I intended it to go, measure twice fit once ...:angel:
I'm about to put it in markets if anybody wants it.
On another note this chap makes them to measure, seems quite helpful and not too expensive :)
rv water tanks,Custom Made Holding Tanks for storage Marine, Boat, Holding, Yacht, Campervan, ,Caravan, RV, Motorhome - Sydney, Melbourne, Adelaide, Perth, Brisbane, Queensland. Australia
The tank measures 750 x 350 x 220 and has three inlet fittings, it can be used in two positions.
If you do use a plastic water tank, it is worthwhle fitting a sheet metal support panel underneath. Particularly important if there is any chance or rocks or stakes hitting the tank.
Make a little box first so you can check that the welds aren't porous. I have heard of mild steel fuel tanks being made with a stick welder, but the fella who told me about it had had a lot of trouble with the welds being porous and he'd had to grind them out and redo them. I think that at the time he was living out bush and didn't have much choice. Later he used a MIG with gas and that worked well, (and then much later he taught me how).
I'd stick-weld a water tank if I could get it to work.