Safe to run and drive?

Don't sweat it man. We'll get something done before the year is out, I believe. I can set one damned post at a time if I have to.
Square your corners first, w/ some stakes and string. Then do a 6, 8, 10, or diagonal method for that. It'll help w/ the roof, big time! Man, if I was independently wealthy, I'd just jump up there and slam it together, carefully, of course!