Here is one of the reason why you need to have more than 1 kingdoms sets, not only for army building but also for more fun! If I didn't pass the extra Kingdoms 7946 set to my nephew, this is how it will look. (using 2 sets)
Fixed Prison Tower 7947 last Christmas and it is one of my favourite set. Here is an idea how an extension of prison tower MOC will look, check out the rooms!
This is how we should play with our lego, assemble them and leave it there on the table. How i wish to have more space for display.
More pics here: