nostr:npub1s7yr2gas9hwdzjh7cs2rfjphettrwe2u9e8erxd50h6kjx5mnpyq36u8ak oh definitely not having the time and knowledge to do something like that. 
Btw, if you like that concept, you should play Beton Brutal from Jan Malitschek.

The game itself is great but it also has a steam workshop feature and a level editor.