I have the Coachmen Clipper 17BH, which is the same as the Viking 17BH you mention. I would love an outdoor kitchen as well, and I'm considering different ways to make it happen. I may build some sort of slide-out tray type thing that fits in the pass through. This will have a cooktop/campstove and some kind of sink. Problem is, its right next to the awning arm, so not sure if that would be in the way.
i would recommend getting the upgrade with the outdoor shower. i also want to add one of these, for rinsing gear, washing dogs, rinsing sand off, etc.
good luck in your search! it seems to really get everything you want you'll have to modify something, which is certainly not uncommon!
