There are four unused gatebot hat models in Team Fortress 2. There are two lights that go into the chest for the Medic (one of them also fit the Scout and Spy), a fez-styled light, and one shaped like a bomb. I have taken those unused gatebot hats and replaced them with four other gatebot hats.
The bomb hat replaces the Pyro gatebot hat.
The fez replaces the Medic gatebot hat.
The Medic chest replaces the Medic gatebot hat.
The chest light replaces the Scout, Spy and Medic gatebot hat
Download includes a 3 wave single player mission to show off hats.
The bomb hat only fits Pyro. The fez hat only fits Medic. These do not replace any player cosmetics, only replaces the four gatebot has listed above. The lights don't turn off when a gate is captured since they don't have an off light skin. If anyone wants to help me with that I will appreciate it a lot.