So, the mod will flow somewhat like this:
Player discovers the decaying structure and a “For Sale” note to buy the property “as is”. (I'm thinking somewhere around $2000 or so.) I'll most likely have the containers set to be owned by the property owner until the player buys it, then they will be owned by the player. From that point, the player can simply use it like it is for as long as they wish. However, they will have the option of tearing down the old structure and having a new home built there in it's place. It will be roughly the same size or a little bigger, but it will not be some sprawling mansion or anything. It's of utmost importance that it fits in the game properly.
In order to begin the actual construction the player will have to negotiate prices and delivery of the lumber, furnishings, labor and other aspects of the project and will of course have other tasks to accomplish along the way to gain favor with the suppliers. While it will not be a combat centered quest, there will certainly be adventures to various places in the course of the quest and the normal combat you find while doing so. But I might just throw in a boss level enemy somewhere. You'll have to visit several of the Mill's in the game for the lumber for sure, and I'm still working out all the other stuff in my head as I play the game some more. But it will definitely be a decent and appropriate amount of work in order to build a house.
So my preliminary plans will generally have at least 3 to 5 fully voiced NPC's and most likely 6 to 8 distinct tasks to complete along the way. If you've played my New Bison Steve Hotel & Lucky Casino and Afterschool Special mods for Fallout: New Vegas (see my signature) you probably have a general feel for my modding style and this should fall into the same type of overall quest and home mod.
So, PLEASE feel free to make suggestions and post me your thoughts!

I played your mod and i really loved it. I totally agree with you, to make the house a bit expensive and also not to make it a mansion. It needs to fit into the world, completely agree with you there 

