Harder than you'd think. The weapon model support is derived from pre-existing classes, so only edits and not really anything new. For perspective, getting even clothing models to work is a challenge in itself, and the framework is already halfway there. PZ needs a lot of work done before any kind of really ambitious modding can be realistically done, but by that point, TIS will probably have added cars themselves. ...You can however replace the player model with a car and play bumper cars with zombie drivers if you're into that kind of thing. true if it was easy youd see at least scatebords or bicycles in the game cuz there slower then a car