To close the entire set will use a squads that I bought at the hardware store, I don't know as universal they are, so I put the plane and in any case can be made in ABS.
The list of materials can be take from Prusa Air 1, you only need to add screws for squads and replace M8 washers of the rods by brimmed washers.
To assure proper fit of the plexi pieces, but the thickness is 6 mm, slots is 5.8 mm. Therefore it is quite possible that you have to file them slightly.
I HOPE YOU LIKE IT!!