I admire their youth, tenacity, vision, and continued execution. Their project is a marathon, not a sprint.
I watched carefully in slow motion - during the first layup episode, as I was curious to see how they planned the layup schedule. Watching the first layer go down, I was concerned, 'oh my, that is not the size or position I would have put down the first layer'. But, as I watched layer after layer go on, they have more than covered any strength and adhesion concerns I had. (I believe they said 10 layers in all, equaling 3/8" additional layup.)
This boats lower hull assembly is - no doubt in my mind - going to be stronger than any other of that model that left the factory. After watching this episode I did quite a bit of reading on the internet as to - open grid attachment, closed grid-pan attachment, adhesion techniques including :
1 - fiberglassing the grid to the hull with traditional materials,
2 - epoxy and glassing the grid to the hull,
3 - Polyurethane (PU) industrial adhesives pan to hull.
My choice would be an open grid which is epoxy-glassed to the hull (what they have ended up doing after cutting open the pan floors). You can see and build each attachment seam.
Internet opinions are all over the place, but in summary, IF the proper techniques and products are used, it would seem a closed pan which is polyurethane adhesive'd to the hull would be more than adequate (this appears to be the Beneteau design). These modern adhesives are so strong they are SUPPOSED to rip the substrate out rather than give up their tenacious grip. I was rather horrified, however, to see the ease with which the Evans were able to chisel up the original factory PU adhesive strips from the hull. Clearly the pan had separated from the hull somewhat easily, and there are other documented cases of the same.
In addition, the closed plan with grid work and finished floors between grids creates a beautiful finish inside the boat, but there is no access to check the adhesive process and bond - one is 100% dependent on a good PU adhesive application and grip when pressing the grid pan into place. Press it down and you are done, hope the contact area is good all around. Can't see anything.
Finally, it was disturbing to see the laminate layup of the factory grid-pan and how it de-laminated so easily between gel coat and underlying structure layers. It is possible the flex of the grounding compromised the grid beams somehow, but it looked more to me like a lack of quality control in original manufacture of the grid pan. The whole point of the grid is box girder strength, which is then securely fastened to the hull. If the girders are compromised in original manufacture the whole assembly is less strong, regardless of how the grid is attached (the three possible methods mentioned above).
Summary - while their layup schedule was not designed by a nautical architect, I believe the end result will be WAY stronger than the original factory build, and they should have confidence in their hull.
And, they are so adorable as a couple, don't you think?
It is just a joy to watch them reassemble their dream. Well done - they.
Best DIY education boat-building channel ? - no. See others mentioned above.
Good inspiring entertainment and inspiration ? - yes.