In FIFA 15, players were introduced to Concept squad. Basically what you could do is put any player on the squad, but you wouldn't be able to use it.

With Clash, it would be nice to have Concept Bases. Whether it's making a farming base for a Th10 as a Th9 or a Th10 making a war base for a Th9. Once all the buildings in that Concept Base is available, the player would be able to copy it to either Home Village or War Base.

To add in a extra detail, there would be a Generic set of walls only for Concept Bases. Sharing the Concept Base in the Clan Chat would also be very nifty.

I'll probably make a visual idea later on today to see if you guys get the point.