you can't, well you could if you modded the game i've seen mods which add battleship encounters and also destructable bases

You can still blow off thier weapons though, do they respawn after a while?
I like the Omicron Alpha system with the Hispania wreck, and casually cruising through the 80 Years War wrecks in Sigma 19. You can't go past the Unknown system from Alpha, its such a purdy place. Then theres the Mollys Minefield which is one of the best places to visit, only because the mollys are constantly blowing up in thier own minefield, I think its in Dublin. They're my favourite places to visit.

Attack, Engage, Destroy, Survive

You can always destroy storage containers for fun and profit. Baltimore Shipyard has H-fuel (in the silver containers). In Hokkaido, you can find unguarded containers along the unfinished trade lane with construction equipment that DSE will be happy to buy back from you at the Chugoku Gate Construction Site. There is also construction equipment in the containers along the unfinished trade ane to Planet Harris in Tau 31. Unfortunately, there are too many storage containers with worthless stuff like scrap metal and toxic waste-- for example, Yukawa Shipyard.

"I'm bugging out. I don't like the idea of being MOWED DOWN."

With the Destructable Universe Mod (sorry, I can't remember the author's name, never used the mod), you can destroy almost anything in Sirius.

What's the respawn time on weapon emplacements and cargo containers?

There is no respwn time. They respawn as soon as you dock with something.

I'm making record time!
If only I had someplace to be...

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There is no respwn time. They respawn as soon as you dock with something.

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How does this work in multiplayer? Would things respawn when there is no one in the system (except for people docked at bases)?