THEY DID IT AGAIN!!!
My local library built out another seed library at a second branch!!!
The first one has been such a success that they've begun to install seed libraries at other branches. This one is smaller but is well used (see the "check out" list) and can be grown easily by placing more holders on the wall.
I like this approach. The main branch is using an old card catalogue. This branch is using wall holders. There's no right way to do it, just what works best for your area.
Word from the librarians are that they're mostly self sustaining. Many folks check out seeds for free, plant/grow/harvest their plants, and let some of those plants go to seed as well - returning those seeds back to the library (or checking in their seeds).
One seed turns into hundreds of seeds. The more this is used, the more it grows.
