Mountable stone walls and siege tower

[MasterAndSilver]

I had some ideas with walls too, take a look at this thread.

Garrison unit(s) in walls

I wonder, if it would make sense (and be fun) to be able to garrison one or more not mounted units in a wall piece. If the wall piece then also shoot arrows, when it is an archer or villager, it would be like a manned wall. For competitive play it has to be somehow restricted behind a tech or something. What are your toughts?