@Beulah Thanks!
@havanaholly Thanks! No, I am not using hot glue; I never liked the stuff. I do woodworking, as well as metalworking, so I have plenty of quality wood glue and epoxies on hand, which is what I am using. I'm dragging an angle form along the glue edge to attempt to give a more realistic wall corner, but I am expecting to have to go back with a dremel to sand.
@L Swearengin I had previously found her, but I couldn't find any meaty details about my particular problem. A lot of helpful tips, though. Amongst other things, I realized that I don't have a lot of small scale tools.
@rbytsdy I might simply be misunderstanding what it means by 'joint'; I work in transportation and joint means a particular thing on plans, which I'm getting the impression is a looser meaning here.
@Summersethomes Thanks!