In my opinion, based on other coachbuilders' renderings of XTS hearses, I don't think this design is too bad. In fact, I applaud their efforts to recreate the late 1950s-1960s design of a Superior Crown Royale. No, this is no commercial glass car and, yes, the windows are still small in proportion to the large top hat, but they're making an attempt to incorporate some style into the thing (i.e. the wrap-around quarter windows.)
I was recently in receipt of some photos of the prototype car that is basically the brochure car...limousine style on one side and landau on the other. While I do not have permission to post the photos here yet, I do feel they are off to a good start with this design.