Okay!
Starting from square one again...
The new floor templates are cut and trimmed. Note the box numbers on the main floor. I really just winged it last time and paid a price. This time, the floor will be supported equally and there will be firm edges for the walls to connect to.
The upper floor with the first steps of both rooms folded over and glued with center pieces to bulk them up to the right thickness
Some of the "boxes" have artwork where necessary while other serve as support.
The top of the box supports have cutouts so I can adjust placement and burnish down the glue tabs.
I redesigned the stairs and numbered them very carefully. I'm installing them one tier at a time so they meet at the proper 45 degree angle. They are a great deal stronger and more consistent than the last attempt.
I'll post more photos when the floors are attached.
Thanks for looking!