Looks like you are making good progress. Some observations:
1. In building, shear is resistance to lateral forces. In California, we are concerned about earthquakes. In Indiana I think your concern is winds. Your are providing shear to the building with the plywood siding. But the only shear on the deck framing are the front-to-back diagonals. There is no resistance to lateral forces left-to-right. You have provided temporary diagonal braces left-to-right to the roof track and permanent diagonals front-to-back. I would recommend permanent diagonals left-to-right on both the roof track and the 6x6 posts. You will have a substantial amount of weight from the deck up which will make the structure "Top-Heavy". A big wind could provide you with a lot of firewood.
2. A boat winch is a great idea especially with the twin-ratio they provide. Perhaps 2 will be needed: open/close(?). The main concern is reduction of friction rather than pulling power. Perhaps a gloss-powdercoated steel C-Channel on each track with (3) 4" poly ball-bearing wheels on each side (in-line, not swivel) would provide very easy movement. You could even install windshield wipers in front of the wheels to clear the snow on the track
3. Standing-seam mfgrs would recommend 2:12 as the MINIMUM slope to prevent water intrusion. 4:12 should be sufficient as the area is maybe 96 sq ft (8'x12')
4. Have you provided power? Coffee maker? Heater?
"The difference between Stupidity and Genius, Genius has its limits." Albert Einstein
Thank you once again for the excellent suggestions. Once I started nailing up the siding my main concern has been to prevent the framing and floor from getting water logged, we have been experiencing a quite a bit of rain here in southern Indiana. Now that I have a watertight building my attention is turned toward finishing the supporting braces both for the deck and roof track. Diagonal braces for both are in the plan and I just need to settle on the exact detail regarding these supports; combating lateral shear from side to side is the primary objective. Did I mention I am designing as I go?
I am still in the design phase regarding the winch and pulley setup and would invite any suggestions regarding same. I do have C-Channel tracks installed, which have been primed, painted, and dry lubed.
I installed 5 each 3-inch inline casters on each side and lubricated them as well. I smiled at the windshield wiper suggestion. I will be installing heat tape to keep the tracks clear of ice and snow this winter.
My plan includes a small breaker box with 110-volt AC power as well as 12 volt DC battery and trickle charger. I have made provisions for both a ventilating fan and small air conditioner. The ac thermostat will be set at approximately 100 degrees to help keep from frying the computers and other electronic equipment; summer gets hot here in southern Indiana.
Regarding the coffee maker, I'm thinking ESPRESSO!
Thank you once again to everyone who has contributed to this thread.
Clear skies to all and of course, “Keep looking up!”