I have a minor concern but I'm not sure if even applies or if it really matters:
If butting more plywood along the already installed plywood over the exposed frame on the left, skewed side, you will likely get flexing between the two seems. Generally, when using plywood roof sheathing, H-clips are intalled between rafters to reduce the flexing between seams or on floor decks tongue and groove decking is used. Sometimes blocking is installed between floor joists where seams meet too. My primary concern is that over time the plywood will expand slightly as it absorbs moisure and when you walk on it the friction at the seam will cause the plywood to splinter there. My concern may be unjustified because the polyurethane liner in my truck is still like new...after 135,000 miles...tough stuff!
