You have an EXPLORER? The game will just fit in the back of it in one piece anyway, you might not be able to close the tailgate, but it isn't like you are gonna be doing it every day. If your panel can come off (and it SHOULD be removable with that design) then you are golden.
The 2 piece design is silly, extraneous, complicates the build, gives you one more place to mess up, makes for a weak point where the top and bottom meet, can possibly result in a "jiggly" cabinet, and it makes the cabinet heavier. And instead of having one big hunk of wood that takes two people to move you end up with two of them.
Also, if you move apartments annually then watch your width. 28" doors are pretty common in some apartments.