A long and low sub is no different to a high and thin sub. Volume is what is most important really. If you want to experiment with things like driver position by simply moving the box, then your planned design might make that a bit more difficult. Also, it sounds as if your vision is to help couple the sub to the room by directly firing it into a corner. This is fine, and not a uncommon practise, but if you find you get excellent performance from your build, and you end up getting to much room gain, it could prove difficult to remove it with a sub you cant just turn round 90 degrees.
The sub will work, and if you have a decent idea of your rooms response then your obviously making your choices for a reason, so go for it I say. Just be aware of the limitations the design may dictate for positioning, so they dont come back to haunt you a little.