Certainly, I agree that seeing the layout would help a whole lot in determining the zoo's quality. I'm planning on doing the layouts when I finish the species list since it helps me determine the layout of exhibits, paths, and buildings.They're not common but definitely present. I see no reason to remove them.
On the other hand none of the above walkthrough aviaries would work - try to separate larger and smaller birds in general and don't mix tiny birds with much larger birds who wouldn't mind a small snack.
Also would be lovely if you could describe the exhibits as well as providing the species lists? Species lists are all well and good but for all I know the zoo could be awful...
As for the aviaries, I feel like I always go overboard on choosing bird species for my zoo. I have over 200 species and I should probably go back and trim some of the fat while reworking the walkthrough aviaries.