I proceed with fitting aft saloon window and hatch flanges I built in my garage during off-season.
It will be total 5 of 18x18" (which I already bought) and 2 of 16x16" hatches (which I still have to buy).
Roof support structure is in progress now.
It was actually started last season (somewhere in January).
Then I took a break 'cause of cold/rainy weather.