Thanks Ross, it's actually a foam filled chamber. Used two part foam filled to the top and the deck was glued and screwed over it. I'm going to build a site after the first of the year that will document the Prospector and my next project, a Chapelle New Jersey Melonseed Skiff, strip built and finished bright.

: Wow - nice work, Mike. Do I spy a sealed air chamber with the feature strip
: duplicated there? Nice touch. We need some closeups!

: Ross