Here's some stuff on set. The "happy days mound mechanic" one is for how to make Annie slip int the mound during the show, regardless of the final design, this should work. However, I'm having trouble with what to leave her to stand on after removing the first floor. A block (more than 8" deep) catches the swinging bit, and another swinging panel would require her to hold herself suspended while manipulating it with her feet. Any thoughts would be appreciated.

The "Happy Days front concept" is a rough sketch of what I was talking about in my post on the blog. Yep.