I also have a 22SFX and I was able to get 2 size 27 batteries in the storage compartment(tight fit but it can be done). You can not use the storage trays so I just mounted the straps to the floor to stabilize the batteries.
How did you find out your build date? My dealer insists he can't find out the build date in advance. He says they will only tell him once it has started being built.