Lo-Fi Games

one of the biggest problems I have with trying to play a nomadic game, is when my team gets badly beaten and I try to rest, I'm constantly being attacked again. It would be nice to be able to crate a fortified campsite that wouldn't classify as an outpost and start bring raids. For that we would need some temporary walls. Such as:
1. Camouflaged walls, basic brush walls that block vision and reduce your camp site's visibility. They would only have a 1 strength so they would be easily taken down by attackers or your own squad. They wouldn't need more then 1 building material if any.

2. Barricades, short temporary walls with minor strength that can be pilled up in or between abandon building to create a redoubt. Only waist high so missile fire can be take place over the top. Not hard for attackers to take down but will slow them up enough so missile troop inside have plenty of time get a few shots off.

3. Full makeshift walls that don't create an outpost. Easily spotted but the best cover that can be provided in a temporary situation.

All campsite walls should degrade over time till after a couple of days they just disappear.

I don't advocate gates for these as that would be too much like and outpost.
However a secret door section that would allow covert entry and exit would be great. It looks like wall but isn't, and the AI treats it like walls until someone attacks it and finds the truth, or sees someone passing through it.

Perhaps you mean something like a Booma?

A Booma is a wall-like construction made from natural branches and wood that is covered in big-ass thorns, its pretty easy and quick to make if the area you're in has such material growing in it. It serves as an excellent barrier against most animals, even big cats and hyena packs. Combined with a campfire its enough protection to survive for a few nights in any location.

It would be nice if we could construct something like this on the fly in certain regions in Kenshi.

Another option is of course to add a Shovel item to the game that can be used to dig/build earthen ditches and walls, like the chest high walls you wanted. Good for temporary on-the-move defenses whenever you are in a place that has easy to dig ground. But also good for incorporating into perminant defenses for a main base. Plus it means you only have to carry a shovel, not large amounts of building materials.