All designs are vanilla.
The Rapier features the best 4 tile wide shield tower I've been able to come up with. It's as chain reaction proof as I can get without losing the shield overlap, though fires do catch in them and there's nowhere to integrate fire extinguishers so DC crews will have to traverse the tower to put them out.
The Sword has an earlier 4 tile wide tower. It's non-explosive, but doesn't scale up, charge as quickly after a jump, or sustain as well because it lacks integrated crew and has the power all concentrated at the back. It may actually be better at this scale, though.
The Vampire features experiments in diagonal towers for deeply protected cannons.
