[Arkcon]

Suicide Junkie said:
"I think a thickness mount for armor will be good too:
EG:
Steel Armor Plating I
size - 1
HP - 3

Then we have mounts:"

*SNIP*

This is very exciting, thickness mounts for armor. Now you'll be able to decide if you want light armor to provide some defense, or build a massive flying brick of a warship.

If only the armor had another detriment -- say, making to ship too very massive would rob you of some propulsion. Can you give armor a fractional minus to propulsion? So piling armor onto a large ship robs you of some movement, but the average amount of armor on a smaller ship wouldn't notice it at all.