A couple of productive evenings this week, got the rest of the framework up for the lower level. I also built and put in a couple of small bookcases for under layout storage. Here are a few pics of the progress:
Helix corner to the right of the door:
Another view of the helix, the lone leg of the layout is visible, shared with the upper level:
Left side framework table, bookcases shown underneath:
Another view of the left side framework of the lower level:
Next are some risers and then comes the subroadbed plywood!