I see lots of problems with this right away. This was a painting on two walls of a room and never in 3D. As such the middle arch that splits the corner can't exist. If it were visable from the projection on the left it would be seen on the back wall of the right projection, not the arch. The arches perspectives are too deep. they run into each other. The balcony is alternately 6 or 20 ft deep. Still if you want to make some adjustments for reality I'm sure you can come up with something great.

 

I managed to get an earlier sketch of the left side from wikipedia. I'm guessing this was a facade on the outside of a building and the dark grays represent actual windows. That's why no further ornamentation was done even on the final sketches. You could leave these blank or create a large rehersal space 1st floor and rooms 2nd, 3rd, 4th. The first arch was probably the door and square over it was the address sign.

This image came from the following book.

Christian Müller; Stephan Kemperdick; Maryan Ainsworth; et al, Hans Holbein the Younger: The Basel Years, 1515–1532, Munich: Prestel, 2006, ISBN 9783791335803.