I was planning on using Derakane vinyl ester for the wing tanks in my modified KR project to combat ethanol but the KR boys in the states are are having mixed results , some have gone years with no problems others were getting a caramel like sludge within months . i will more than likely go with the aluminium .
Here's one way of doing it http://www.krnet.org/wingtank/
I am considering pumping from the wing tanks to a small plastic header tank http://www.summitracing.com/search/Part-Type/Fuel-Cells/?keyword=plastic+fuel+cells they're perfect ,come in a range of sizes and for the price i dont think it would be worth the effort and cost to make one out of fiberglass .
jason