A nice snug fit requiring no glue. Small pieces can be glued to the shelves, or print multiple back pieces to change out the contents of the display.
I did use the queen anne legs from this
https://www.thingiverse.com/thing:18982
queen_anne_back.obj | 7.2KB | |
queen_anne_display.obj | 95.1KB | |
queen_anne_display.stl | 158.0KB | |
queen_anne_display1.stl | 13.6KB |