How did UNSC Bases look like?

So if you’ve played Combat Evolved you might have wondered where they brought all the surviving crew and fighting force of the Pillar of Autumn. I read somewhere that they did set up a base on Installation 04 but they never described how it looked like.

I doubt it would be like the bases in Halo Wars because they had certain ships that could create Firebases in a matter of minutes on board the Spirit of Fire, and tbh the whole concept of the quickly made base is probably more gameplay element than canon.

I’m just curious to know this part of the universe because I’ve watched some Halo mods on another game and the bases they made there look pretty realistic to what the UNSC would have set up on Alpha Halo. Would they have trenches for defense? Those temporary static Gauss Turrets that we see in Halo ODST? Would it even be fortress like or just a group of tents together because of the lack of resources they had access to?

It is described as being made out of forrunner structure and caverns.Thats all we know.

They just fortified some Forerunner structures. It was on a raised platform with (if I remember correctly) only a few ramps up. They also got some of the Pillar’s point defence turrets and set them up, along with a few stolen shade turrets. So it wasn’t really a proper base, just a fortification made of anything they could put together.

It was just a defensible position within the forerunner buildings on the halo

It was a butte on a hilltop, and the insides were caves and small caverns. There was also a forerunner structure built on top and inside it.

As already mentioned, they were at a Forerunner structure on top of a butte filled with caverns, but didn’t they have tents set up as well? I could be mis remembering, but I always pictured it as a “fort” with the canons around the perimeter, tents on the inside next to the structure which was the “command center”. It’s been ages since I read The Flood.