I would remove the deck and trace it on a sheet of 3/4 marine grade plywood cut it out and sand edges. You could then carpet it or put rubber on it. Hope this helps. I’m planing on doing this to my Crv when it’s time for it.
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You know, I've thought about using something like a washing machine drain pan that would look tidy, be fairly strong, and keep water from seeping below.
¾" would be serious overkill. ½" is a better size. It's not spanning a 6' gap, just covering the spare tire well.
If it wasn't for the dive gear, just fixing up a car normally, I would say use ¼" or 5mm. So ½" is already doubling up what would normally be the fix.
The Weathertech cargo area mat is fabulous. I have one in my Escape. The factory is in the Chicago area and I got mine there. Worth every penny.
Have you checked to see if they make a factory floor for this? My ‘22 soul didn’t come with the floor but my ‘15 did, I started off with some 1/2” exterior plywood but ended up buying the factory replacement.
Looking on line I see a two piece replacement and it looks like they slide into guides, you may be able to make something to stiffen them, I use the sound with the rear seat folded for diving, and the replacement floor works great and is fairly flat, easily hauls tanks and lead and all the other crap needed for cold water diving for two people. Maybe the two piece replacement is more ridged??Nothing on Google, just the factory part that buckled after a year.