I may or may not work on this, but I still want to pass it out to be thought on and maybe get a "rival" to compete with. The thought essentially revolves around a roleplayer's dream - building your own house from scratch. Literally. Take for instance some of the ruined Springvale houses. There are two ruined houses upon this little bluff, and one of them is really nothing but a shell. No junk inside it or anything, just a bit of posts and ruined walls. The mod might take place there, building in that spot (though, I think I'd rather pick somewhere a bit more remote).
So the player rolls on down the hill to a special mod added car. It being a container, he (I'm going from my character, being male) cracks it open and pulls out a couple "Sheet Metal" (doing this a couple times until he as enough). Back to the house, a small button/activator on one of the posts is activated by the player, taking the sheet metal out of the player's inventory and it appears on the wall, already in place and ready to roll.
The whole house features that concept - the player goes scavenging for goods and builds his house bit by bit. Using FWE's camp gear he could camp there, until the walls are built and roof is up. Then, adding a door, the player gets access to an actual interior (so that nasties don't come and get ya!) and the mod is taken further, with furniture and suchlike, including a possible guest appearance by a later-to-vanish salesman who sells you a generator that provides electricity.
It's only a thought. But it's very doable and with a simplistic "unmarked quest" style approach it might give a prospective homeowner a few game hours of enjoyment.