Comes with the gas engine and Allison transmission (no diesel Fusos for North America now) and they do all the rest.So how does the 2020 chassis work? They buy a new Fuso and replace the engine, trans, and axles? A gas engine makes a ton of sense.
I would add a composting toilet and some way to add a canvas cover over the cabin section... it would look more like a delivery truck for those times you want it to not stand out. Could still access the interior through the pass-through...