Woodster, I just measured the thickness of the cabin top this morning by removing the trim ring at my dorade air cowl inlet. I was incorrect on my measurements earlier. It measures a little over 1.25 inches thick from top of roof to inside of liner. Looks like 1/2" fiberglass top with 3/4" plywood core. I don't know if this is typical on all Cherubini's or they just took a little extra time on this one. Anyway, I am pleased to see this. No wonder my deck is still rock solid.