It looks great. I keep having to remind myself though that this is a show about people filming DW, and not the filiming of the show itself!
Which I suppose is the point, despite the obvious inaccuracies. I'm certain that this set will not be seen THAT much in this special; most of the action will be in the offices and environs of the BBC TV centre. Key episodes will be re-created for shooting here though aside from a momentary tribute I don't think anyone will expect them to be doind a shot-for shot remake in any sense.