Also yes, frame is unbreakable. its heat cant be changed by other materials, it doesnt burn, dmg does jack !-*/*/ against it, and and it doesnt interact with any materials. (aside from piston but piston can "beat" any bunker that has gaps, so it doesnt count)
you used frame and you still couldnt defend against protons.
the frame isn't unbreakable?
The only thing that's difficult is frame since it's an unbreakable solid?