Here it is up! Everything came out level in the end. If you use the cob pin method to mount things, don't crank down too hard on the bolt or you will pull it out of the stud!
Also, I still need 10 wooden pins to finish the display, 1" standard thread and 1 1/4" or 1 1/8" shanks if anyone had some they'd like to part with ;-)
Update: Got a set of pins in good condition on eBay.