Classic view has more admin tools than mobile view but teachers wouldn't know the difference. We haven't have many issues with PARS and when we have, support have fixed it quickly.
It sounds as though this would be a fairly easy app to make if you have some experience with app development.
If not, would something like google drive not work? Just put the image in a word doc and let everyone have access. Or there must be a task manager app where you could add different sections of the school (not with an image though).
We are in the process of rolling them out. We are writing a blog documenting our journey and findings- still early days though. The address is sjbsurrey.wordpress.com
We have developed our own app that incorporates planning. We are just testing it out at the moment though so don't know if we will go down that route fully yet!
We have an iOS app for our school at the moment with general information- the school calendar, term dates, our prospectus etc. I am in the process of making one that students, staff and parents can log into and get specific information.