those are wood half slabs, don't ask why just seemed better than alternatives.
controls are a bit jerky due to server overriding client data
occasionally pressing c does not work. honestly i cant find the reason for this but restarting minecraft fixed it for me. Still working on it.
Looking good, but it needs:
-Better Textures. It doesn't need to be exactly like the minecart.
-I think a jump button would be nice, that way we could climb one block by jumping it.
-Sounds. But it can't be too loud, and if possible, only when driving it.