Here are a couple shots of the catwalk system as it's coming along. I put together some of the new support beams and they work great.
Clearly photography is not my main profession... Here's some closeups of the supports in "action":
The catwalks themselves have TLX anchors on the tops AND the bottoms:
Those two anchors on the bottom, combined with the supports, make the catwalks really stable. They're a little fiddly to get into place, but it seems worth it.
As for the towers, I'm going to try to plow through as many of the tear-drop shaped tower floors as I can tonight:
My hope is that I can get enough done for a three-story tower. I don't have the posts or walls for them yet, but those are easier to make than cutting out the round foam core tiles.