Its a composite sandwich (carbon - 5mm coremat - carbon). Might sound / look a little exotic but its really very easy to do and a great 'my first composites' job !!
If anyone is interested I can post up a DIY how-to. I did this time lapse video of making the first one on my Swordfish ...
From the video there are a couple of points of interest:
- Used 10mm coremat which was not a great choice (too heavy, too thick, more heat curing etc)
- The black strip on the boat at the very start is 5mm rubber to simulate the thickness of the foam on the finished item
- The brown (with yellow backing) stick on stuff is a self adhesive non-stick product which is awesome