By that, I mean is the wooden part of the backbox identical across the entire series?
I recently acquired a Doctor Who and have spent quite a bit of time working out all of the kinks and getting it to play right. I'm very happy with the game, there's only one problem... the backbox. There's quite a sag to the bottom board of the backbox, and the plywood has delaminated and is pulling apart the upper corners. My brother in law, who has done custom cabinetry for a living looked at it, and suggests it would be easier to replace it than to try to repair it. If necessary, he can build it for me from scratch, but I'd rather not go that route unless I absolutely need to.
So as my question in the title asks-- are all the WPC backboxes the same? If I need to be looking for one specific to Doctor Who, I'll have him build one. If they are interchangeable, I'm hoping that I can find one locally.