I get the feeling that would be relatively easy (scaling is cake, maybe jump height etc would be a little tricky), although I don't know about editing the skin outside of modifying the uv texture (or a copy of it specific to the scaled player model). Unless that's exactly what you mean? In-game or export it to a little user content dir maybe?
We've talked about a user content data thing in the past, when you can make custom blocks or other things in-game.
We've talked about a user content data thing in the past, when you can make custom blocks or other things in-game.