[aardvarcus]

Thanks everyone for all the encouragement.

WDB,
Unfortunately at my current rate I could turn out 2 or 3 every decade.

Freebeard,
It only is that thin at the back of the top, it gets thicker as it goes forward to a max of around 3 or so inches. I did it like that to maximize the view. I am going for fixed windows all the way around, and plan on hinging the entire cap to accommodate larger items.

As an update, I started to put fiberglass on the cap yesterday evening, and promptly ran out of epoxy resin and hardener when I continued this afternoon. I seriously underestimated how much it would take to make the initial coat and wet out the first layer of epoxy to the extruded polystyrene.