Does anyone know if the API can handle this?

Moderator edit: Please do not attempt to bypass the URL filter, thanks.

New models like what? no they are all made of existing models/skins for existing models/etc afaik

Sadly enough, Rust does not support custom resources (like gta 5 or gmod). You can change existing items by making custom workshop skins.

How is the guy adding sharks to the water????

Carpet with a skin or something. or look at the code of the plugin lol

You can't it's an extension (dll).

and what lol, whats the issue of decompiling etc