It will still look stockish, but will be just a bit longer in front, but will still be off the floor, not to get wet,and it will still look sealedwith exception of the gap/port at the rear, on top only?Same concept you had drawn to finish , just adding air-space in front of the sub to give it reflection/Acoustics at the same sealed disign you want,.If you have ever use s SAS Bazooka Bass Tube, its the same concept for the woofer to fire off the side of a fire wall approx 4-8inches..If i could draw it out on here id show you what im trying to give you my opinion on, and its a simple add, and cheap to do, that will make the sub perform nicely
