So I took some inspiration from SixFootBlue and the Transmobifier pack when creating this awesome stuff, but check out the final product! I made the motorcycle to reskin and change the model of a horse, and its fully functional only after naming the horse in optifine, and it doesn't affect vanilla gameplay at all. I made this pack custom for a friend/client, but wanted to show it off a little bit. The other stuff in the video is other work I've done for fun/personal use. I should also mention the tree hat came from HermitCraft and Scars hat, but it works the exact same way. If you'd be interested in custom stuff like this let me know!

The youtube video is attached!