I am kind of on the fence on this, I originally thought the same thing but a friend of mine recently got himself a Pusher Class A and it has the door in the same spot.The conversion you linked is really nice except for the RV door in place of the original door, which is completely unacceptable for visibility reasons. Buses have ridiculous blind spots to begin with and there's no way he can decently see to the right with that door. Combined with the lack of hood mirrors he's probably tried to change lanes into a car next to him more than once. If you're going to add an RV door you should put it farther back on the body... the way RVs do it.
Random internet picture for reference:
I think the key is to remove the smoked glass from the RV door and put in conventional glass and LEARN to use the mirror's religiously.