While dreaming of building twin pan 91s, I have been able to snatch some time to continue the goods shed.
Fitting the roof of a big building is always a pain as it always ties to bow upwards in the middle where you can’t clamp it.
This is my solution- bulldog clip on the bottom of the back wall, string tied to it, looped over the top and a weight hung on the end.
You have to be careful not to put too much weight on or it bends the overhang and you have to put the tension on the string as you go to avoid it catching and lifting the overhang at the back as you add the weight at the front, nylon string works best as it doesn’t catch as much.
While that was going on, it left enough time to start the office building which will be attached to the end wall.