Plugin Request Mobs with special paths

Hello!

I want to make a new kind of Tower Defence that I've not seen any server have. However for this to work I'll need a plugin to make mobs walk from one place to another.

Like, let's say a mob spawns on green wool then I want it to walk to a beacon. The player must then make a maze with towers to prolong the mobs path to that beacon. Also I'd need the mob to destroy a tower if the player completely blocks the way.
Is there any way that this would be possible? I've not seen a plugin do what I want yet.

 

@XkarenX
I've thought of making a plugin like this before, but the problem is that it would require modifying the mobs' AIs, which is possible, but difficult because there isn't a Bukkit API for it. I played around with some mob AIs before, but the 1.8 update broke it. I'm not going to make any promises because I'm busy, and unfortunately also very lazy, but I'll let you know if I start working on it.

 

I'm using 1.8, I'm new to the bukkit form, didn't know there were different sections for different versions.

Ok thank you!

 

Ah ok, thank you!