A nice thing to add would be a custom career, with custom payloads and custom contracts.
Players could create their own tech tree, and maybe even custom "stock" parts for it (Like engine that replies the V-2 engine being unlocked at a tech tree node).
Create your own customer using a image of your choice.
There might also be an option to publish it on this website
(did not find anything like this, so I decided to suggest this anyways)
@Pedro Where's the juno new origins file then cause I'm confused