I have posted up some tanks on ebay that are fiberglass construction. They are fish tanks first and solid enough to do electro derusting if you wanted. As usual all money goes to a well known engine supplier!

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=4354310672&ssPageName=STRK:MESE:IT

cool....