Hey IslandJim - yeah, they can remain in place while the seats are up and the hatch is down, though admittedly, I got lucky. It's a little tighter than I would like it to be.
The plywood dimensions itself would fit no problem, but I didn't account for carpet padding and the carpet itself...
Thanks TheNotoriousTRD for the inspiration. I was trying to come up with a lighter weight solution than using a single 43" x 41.5" inch board. Saw your post and it was one of those "DUH" moments. Split them into two boards! I had some 5/8" ply and some 2x4 scraps laying around, so I went to...