[snip] Re - getting a metal tank. Have you considered getting one fabricated? It might cost you a bit, but if it works out, you might have a small business for yourself! Ya know... that may actually work. Especially if you made it so the stock elephant ears where an option... like maybe a little smooth filler plate that could be left in place, or removed to use the stock tank wings... ...with twin petcocks, one left one right... hmmmm.... could be on to something here... I dunno if you could sell enough to break even, but it is an intriguing idea.