If you are gonna change ir up take a picture of it.
Its not that difficult to make a 512 x 512.
Do you really think that every base will be unique?
Are there that many people capable of turning in a map that will be accepted?
Why not make it a prerequisite that maps for field layout be provided and documentation on any unusual features be noted. If map designers know this from the git-go they can work this in as they go.
