Still not having any luck getting the second display to operate as an independent workspace. I'm glad I found the 1920x1080 monitor because it's a lot easier to troubleshoot a screen just to the right than a projected image that's behind and over your shoulder. (plus, it's not burning minutes off our projector lamp)
Nevertheless, it would be nice if I could get it up and running. Sadly, I don't feel like I'm really going to learn much from this exercise other than how to get two displays with separate workspaces running in Ubuntu. I guess it's learning, but it's specialized but probably not applicable elsewhere.