Just wanted to share this information with everyone.
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Tim,
The article seems to be aimed at a small boatyard, and not a do it yourself type person. Regarding the legality of it this link will reference you to the appropriate USCG web site. It basically says that a tank has to be tested at 3psi without leaking. A prototype has to be fire tested either in a fire chamber or a hull section using free burning heptane for 2 1/2 minutes. Also the tank has to be designed (not tested) to withstand a shock test of 25g's for 6 to 14 milliseconds if it is to be installed forward of the midpoint of the boat. Less if it is aft. The tank needs vents with flame arrestors etc.... Then it needs a label with the name of the manufacturer and that it meets these criteria. There are requirements for the label as well. Please read all the info at:
http://www.uscgboating.org/regulatio.../183-510-a.htm
I think that just buying a tank would be a much easier solution, unless you are going to make a number of them like in a production run.