I second the hot glue gun.
Unless you need to span any empty spaces where you haven't got any foam, I would just go straight to the fiberglass. IMHO, fleece's only use is to stretch across between edges, it's not as strong as matte and resin. I like to use the thinnest, stretchiest, cheapest material I can find at the 'Mart. Doesn't eat up as much resin and doesn't add the bulk like fleece does.
Post some pics, it sounds cool.