Thank You.
Since I'd been planning to set my game in space, I started looking at what kind of protection is best against cosmic radiation. Turns out the best method is to surround the crew with water tanks.
These of course take up a lot of space, so the idea for my mech was that it would have a very cramped cockpit with no external windows due to this.
I felt like calling it a "Casket" mech would make sense given the sealed in enclosed space that it is.