Preview of the final floorplan
Thought you might want to see the final floorplan. In case you're just joining in, my needs are a bit different from most in this community in that I have a large family. This rig is designed to travel as compact as possible while still providing a lot of room for sleeping and eating. So I designed a unique, thoroughly untested, slide-out system. It's simple and strong, and I think it will work. This shows the body in the "travel" position, 22' with the cabover, and 17' at the chassis (total truck length just shy of 30'):
The configuration is typical of a galley/dinette setup. Each dinette bench as three slide-out storage bins. The sink, range, microwave, and refrigerator are all accessible.
Once at camp, the "nested" slide is deployed, first 8'3" to the rear, then the side slides deploy right and left 27". The table moves to the dining room, which as a fold-down bench and fold-down counter-top for additional food prep space. There's also room for 6 folding chairs (5 are shown), which are stored against the walls between the slide and body during travel.
The "dinette"/side slides convert to full-size beds, and there's an optional single-size bunk platform for each side. Lucky for me the business next to mine is a custom fabricator of vehicle and boat interiors, so they've designed some nifty convertible cushions/mattresses. So we'll be able to sleep two over the cab, 2 in the dining room/galley (table and bench convert), and 4-6 in the slide.
Having such a large slide to the rear was a fun problem to solve, but I'm confident in the engineering at this point. As it rolls out, it's weight will be supported by a folding platform much like a liftgate platform (which also doubles as a motorcycle/atv hauling platform) with it's own set of drop jacks. The slide mechanisms are a relatively recent invention from Schwintek, now a part of Lippert Components. They're strong, light, and simple, with a very easy manual override. Thanks to honeycomb panel construction, the entire slide component will weigh less than 800lbs, including all cabinets, mattresses, etc.