Ok - so was able to finish the extended deck.
We used cardboard to get the angles right for the bottom side. Cut a piece - shave it, use it as a template.
We were also able to cut the front hatch and pre-install the cig lighter adapters (which illuminate blue, these will be hardwired to the accessory battery).
Ordered Vinyl a couple days ago and only have a few more pieces of wood to cut.
Lighting in the boat is not complete, but can't complete until the vinyl arrives.