How far can i go with copy rights

Basically you shall not produce something that might be mistaken by someone’s else brand or you would face a lawsuit.

To clarify things I strongly suggest you to read and watch:

https://forums.unrealengine.com/unreal-engine/marketplace/1407198-marketplace-policy-on-copyright-and-trademark-protected-content

https://forums.unrealengine.com/unre…e-from-epic-hq