Questions about modifying objects in Rust

I enjoy Rust and 7 Days to Die very much. I was wondering would it be possible to implement a similar system. Here is my thought.

It would be PVE. There would be random enemies spawned during the day, and some just hanging around monuments. At night a group would spawn and target the players. I was thinking that the TC would be the defense point. If we could limit 1 TC per game, the players would have to defend it. The enemies would come in waves and get tougher and tougher every day. The goal would be to see how long you would last.

Do you think this would be possible and would it be possible to bring in other objects to the game? Like different zombie models etc?

 

What about controlling the AI of the zombies and scientists? And maybe their spawn points?

 

I have been working on making a server that sounds somewhat similar to that (my bots spawn at monuments and other points). To spawn the NPCs I used the BotSpawn plugin. To give the enemies a different feel than standard "Murderers" or "Scientists", I also used the Kit plugin.

BotSpawn allows you to specify a Kit for the Bots, so I created a few kits with a military type clothes and weapons to give them look I was going for. I'm not sure how you'd implement the rest of it, but I'm pretty new to modding so that doesn't necessarily mean it couldn't be done.