I have to agree with @GyverX. Excellent re-purposing of blocks with an ingenious design philosophy. I thought it had an insane amount of thrusters and that landing pad on top took a minute to get used to but once I understood the thought process behind it, (ship types/design meant to be stowed + mass of said ships + gravity), I warmed right up to it. Excellent job!

"It can handle up to 4 railgun shots in the same spot." Two on each refinery.

It can handle up to 4 railgun shots in the same spot. If you add some welders, it resists forever (while you have resources on cargo containers at least)

How anti railgun armor work?

Im impressed, This is a well done design, Functional and has some great imaginative use of blocks to break up the usual use of blocks. Be proud of this one, It is a great design!

MMMmmm, yes. Anvil Liberator vibes

Chongus

Wow, very nice concept. I think I haven't seen anything close, I want to check it out.