This weekend I made some great progress on the basement and am happy to report that the home theater ceiling is done. My plan for a simple perimeter of Armstrong ceiling tiles around a curved tray ceiling turned out to be much more work than I thought. Part of that difficulty was due to this being my first experience with any sort of suspended ceiling system. Once I got the hang of it, it wasn't so bad. Then I put some crown molding on the inner edges of the two long sides of the tray ceiling...