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Hi James. Yes, It's tough scavenging odd parts in a small community. Like
Dan said, if you used a common mild steel, and planned on replacing it later,
that might be a better route. You could use a mounting method like bands or
straps so you don't have to cut/weld when replacement time comes. It seems like
you could coat the inside of a small tank fairly easy and increase it's
longevity in salt water. Good metal prep before you weld it closed, and pour in
a good epoxy paint. That's probably cheaper than stainless. How about an
aluminum scuba tank ? a used one or two found on ebay would work, and the used
ones that are too old to be used for scuba can be had for $20 each. They have
3/4 inch threaded holes so would be easy to plumb up. Frank
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