We have documents that are useful to everyone in the group about our aircraft.
We have 1 aircraft in our group - if multiple aircraft, docs would need to be grouped in some way.
From memory we store copies of POH, quick reference guide, engine manual, calculated stats (fuel economy & type of flight), radio instruction manual.
Another thing I noticed, is that if data in a field isn't valid (text in a date field / invalid date in a field) then when save it pressed it says update was successful but the invalid fields are blank, without any additional feedback.
Sorry - I've got a day job - don't have time to look any more at the moment! Good job on that quick turn round!