When I always highly admire people who accomplish their big project, this one lacs exterior finish.
The rough fiberglass with air holes is going to be heck hard to maintain.
But on positive side, he made very smart design with dropped roof. Thanks to that he has high cabover, while AC and vents don't go over 13' of height.
My fleetwood has about 3" drop and when it helps, the AC still sticks over a foot above everything else.
Rear "slide out" who doesn't take interior space is very admirable as well.