I have posted the photograph as I think as I was at first confused over terminology and variations in mainly the Brood Chamber,box,body or even a deep no confusion when you know but for the first time different story and then we throw in 14x12 and then talk about ekes its no wonder new beekeepers get confused.
So as this thread is aimed at helping new beekeepers decide on hive designs the photograph showes
On the left a standard national brood Chamber
In the center is a 14x12 brood chamber
And on the right a standard brood chamber sitting on a eke converting it to a 14x12 brood chamber the eke is easy to make either made for the top or bottom they can also be yoused in conjunction with a super if you have no spare brood box and you need to house a swarm quickly although it will be slightly higher than a standard brood chamber
I hope this is of help