So Bedrug got back to me Tuesday afternoon, reversed their original policy on not sharing details on their products, and told me the VRTC11 has max dimensions of 72.5" x 57.5". My cargo area max is roughly 67" x 56.5". Looking closer at the Vanrug pics, I see they have the forward cargo floor extension in place, which I removed with the partition and rubber flooring when I inherited the van, since it was all totally trashed. I can't see any obvious reason the '11 shouldn't be "close enough" to work in the '10, and knowing what I know now, it's probably the best value proposition, and I may buy one in the future.
To their credit, Bedrug also apologized for the delay in communications. Unfortunately, I needed a floor in place this coming weekend, so when I didn't hear from them on Monday, I started slapping together some carpet-over-wood Tuesday morning. It's not great, but it is passable. It's what you would get if you told a redneck to approximate Windguy's floor in one sitting and one trip to Home Depot. 5' of the cheapest grey carpet in the store on 23/32" RTD with 6700 adhesive (for "outdoor"/non-backed carpet), just barely stretching out one of the small containers. Wood is neither primed, painted, nor sealed. Bottom side is stapled. Lopped either ~27+7/8" or ~28+7/8" off the back of the plywood and rounded the front corners with a jigsaw. Held down with 6x 3/8"-16x2" bolts, all in the front, partially countersunk. Total project cost is just under $100. Actually paint the wood and buy enough carpet glue and you're damn near the price of the Vanrug, but whatever. Van is quiet. Floor is more comfortable. Corners are dirty. Fuel economy doesn't seem to care about the weight of the plywood.