Thanks for all the encouraging comments.
Got the Nautolex installed today:
Here's the method I used:
I prepped all aluminum by cleaning with acetone, and I used a damp rag to go over the plywood. I cut the vinyl to length. I drew a line straight down the middle of the floor and the underside of the vinyl. I then used that line to set the vinyl in straight.
I used several steel weights and sandbags to keep the starboard side from shifting, while marking and making any necessary cuts to the port side:
Flipped the port side onto the starboard side, and applied contact cement to all surfaces and vinyl, right up to the center lines:
I set it down starting in the center, both length wise and width wise, and worked my way to the stern, and then up to the bow. I used a piece of PVC pipe about 3' long as a roller. Took a break, came back, removed all weights (it couldn't shift now that one half was glued down), and flipped the starboard side onto the port side, made the cuts, and applied the contact cement:
Used the same method with the PVC roller to set the starboard side down. It took me about 8 hours total, including a dinner break and a trip to Lowes for more contact cement. 1 gallon was not enough after using about 1/4 of it on the ski locker.
I decided to hold off on cutting out the hole for the ski locker, because I think it will be easier to do later.
A few notes about my cuts in the bow. I set the consoles in place and marked and made these cuts so that I can later do 1 solid piece of vinyl in the areas where the vinyl will be exposed from top to bottom underneath each console:
Everywhere else, the vinyl going up the sides is blocked either by the side panels or the bow seat.
I made these cuts along the line where the bow seat's supporting aluminum piece will attach:
I did this because everything above that line will be visible, and I will add vinyl there and I want it to be one piece when I do. Below that line I still wanted vinyl because it's inside the bow "cubbies".