RC plane modular wall storage system

A NOTE TO DOWNLOADERS:
I have deleted all my designs from Thingiverse. I keep my Thing pages intact to leave a target to bookmarks, but you can't download my Thing files from this page anymore. Instead, please go to
https://www.printables.com/model/88384-rc-plane-modular-wall-storage-system
Of course, you can download from there free of charge and with identical license conditions.
Sorry for the inconvenience, but due to the administrative neglection of Thingiverse this site has become too buggy to be trusted anymore.

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RC plane models (especially motorized models with a landing gear) demand a lot of storage space when not in use. Plus, the place where you store them must be child-safe (cat-safe, dog-safe...). And, on top of that, plane models don't last forever, meaning that, according to Murphy's law, they will have a crash landing right the day after you set up an individual wall mount that will not fit the next model you buy as a replacement...

This storage sy