Gym vestibule, skylight, and pool

I've been having a lot of fun working on the gym elements. Over the past few days, I have created:

The vestibule doorway:

Roof for the gym (still needs re-working, because it does not match the trusses very well) and skylight:

Beams, unique lanterns, bleachers, and rail for the pool: 

Finally, half the balcony (to check the scale):

The balcony may turn out to be difficult because the plans don't seem to match up with each other. The original plans describe a running track, but according to photographic evidence, this was never built. Therefore, there is a single page of blueprints showing "additions and modifications" to add the balcony. This page shows a small room that is not on the blueprints for the rest of the gym. This is understandable, as the balcony was not added until about 1925, so a room could have been added between 1918 and 1925. If I cannot find photographic evidence of this room, I may need this to be another (rare!) case of artistic license.