[lrtexasman]

Flush down on the deck?

My 2011 cannot. I kind of gummed up my carrying capacity, plywood-sheet-wise, but getting a Retrax box cover, but I believe that even without the Retrax, I could not get a sheet of metric plywood (60" x 60") in the bed.

Sure would like it, because I plan to get a G2 2017, and I use metric ply for projects.

See below. Wont fit flush, you would have to lay some sort of base to flush bed and you would have to tilt in and out. The rear quarter panels where the bed closes looks to get down to about 49".

The 2017 Honda Ridgeline features a 5-foot (1.5 meter) by 5-foot 4-inch (1.6 meter) bed, wider and longer than the previous generation. This makes the new Ridgeline the only midsize truck with a full four feet (1.2 m) between each wheel well, allowing plywood, drywall, or pallets to be loaded flat on the bed floor. Payload capacity is nearly 1,600 lb (726 kg); full specs will be revealed upon launch.

 

[lrtexasman]

I was referring to 5' Square Baltic Birch Plywood. There are a few applications for plywood that size including marine, plane, and cabinet building.

3/4" Baltic Birch Plywood
Description
18mm, 3/4" Baltic Birch Plywood - 60" x 60" (13-ply).
.