I'm addicted to large lots, so this would be a challenge just in that aspect
It is an interesting concept. My suggestion is that you get some rules, ideas from what you have created and maybe those posted here and check to see if a project could be started from it. Most of the project stories, I think, have town jumping, but the idea of a floor for each generation, of finding a way to bring in a sim from another town, the heir has to go to another town, find a mate and bring him/her back to produce the next generation is something that I think would be fun to do.
I'm going to go over what you stated in your first post, what you set it up as and see if I can do that. I can see me now, trying to not give into moving to a 50 x 50 or bigger lot for my family
I may let myself start with a lot a bit bigger, say 15 x ? ? ? to get an idea of what it would feel like to play in such a small lot. Put a study and exercise room in the basement and the family lives in the floors above the basement. MV has a lot of small lots and I really like that town.