Here are some more photos with progress on my Circus model.
At this point I'm about halfway done the build, and I've got the feeling everything will work out. The tricky part will be the curving section at the one end, where I want to have the stadium seating curving around the round end of the track. We'll find out if my scheme works later on ...
For now, pics of the straight portion:
Archways along the outside wall.
Archways look like this under the seating ... this part will be covered over.
View of outside wall with arches.
Building the seating:
Overview of the fancy end of the track ... in planning.
Pillar with statue lion for decoration (dry stack).
Overview of track: