Originally I was planning to make a fuel tank for my truck, with that in mind I found these folks that sell components to make aluminum and stainless tanks, filler necks, sending unit flanges and so on...
http://www.southtownsllc.com/
Never dealt with them though, I found the perfect tank already put together.

Grigg


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-