can there be somplace where you can show off things you make in UE without having to put them in the marketplace? i areaty have a Static mesh that you can go through without a doorway.
You didn’t visit UE4 forums yet? There sections for that in front of you 
If your stuff is still work in progress post here:
https://forums.unrealengine.com/forumdisplay.php?11-Work-in-Progress
If you released it or just complete it, post it here:
https://forums.unrealengine.com/forumdisplay.php?13-Released-Projects
If by post you mean host your stuff, then you any file hosting service like rapidshere and link it in to the forum post
thank u!!!