Good attempt at something new, but I don't think it works well at all. If you have a child or a person sleeping below, you can't easily get down from the upper bed without risking stepping on them or waking them up. Also, with the dinette set up, you lose the windows and the interior would be quite claustrophobic. With the upper bed pulled out, the lower bed would also feel like a cave with no easy exit, given that the side cabinets close you in from both sides and you know have a low roof above you.
Another problem is that when you are cooking, with the fridge on the opposite side, you will be constantly turning around to get food out and put it away. Much less efficient than the current design. Also, with the fridge in the back of the camper you can reach in and remove food/drinks from the ground. With the fridge deep inside, this is much more difficult, especially if you are storing any gear in the center aisle and the top is down.
On the contrary I think it's probably the best you can do with a rear entry. You end up stepping on the bed with the current layout too so I see no difference there. In general I don't really consider these campers really usable for more than a couple realistically, maybe one smaller kid tops (in my opinion). A kid would sleep under that fine. Realistically when you're only talking a couple you'd only try sleeping down there in stealth mode when the top was down (so no biggie there) or one up and one down in which case the top bed wouldn't be pulled out.
On the cooking front I try to just get what I need once to cook to minimize the in/out on these fridges to maximize efficiency. Yeah not as easy to reach in from outside the camper but not much of a downside in my book. I think this is huge improvement over the galley/couch route. I haven't dealt with the galley/dinette route but with the couch it is a constant dance with 2+ people in it because folks legs are in the isle, etc.
But that is what is nice about options, pick what you want (or build your own).