Check out tamksinc.com. they have several off the shelf tanks that could do the trick. I believe they also sell necks as well.
Regarding the steel tanks rusting, what I have done is treat my new tanks like they are going to rust. I clean them with strong detergent followed by phosphoric acid, then line them. I used por15 in the past, but found it to come loose or break up after a few years. I now use bill Hirsch tank sealer (2 coats) and am happy with the results.
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