The next time I went out there, I took one look at that unfinished roof and figured I could SOMEHOW finish it solo. Step 1 was to "splint" the receiver and install the last 2 purlins. The splint was not TOO hard-
The 8" x 25' purlins were another story. It was a long, hard process, one step at a time up the ladder, to get them up there.
Then, anchor one end with a pivot bolt, fix the other end, then secure them, etc.
Drenched in sweat after 4 solid hours, I got it done.
I checked deflection, and the splinted corner is almost identical to the opposite one. I'm satisfied, but I'll brace the north end on the container roof anyway, after I install the gutter & downspouts.