I would say no, this is a gasoline/diesel (mi guessing) and also went out of production 3 years earlier than the first year of the ecv. Also will be lot bigger
Vanilla Box upfit can hold 6 XL Cargo Boxes, without stacking them (Not sure why you can't, there's more than enough room for it). I could see this having maybe 8 boxes, and stack them to get 16 boxes. Hope that will happen.
There will be different lengths, narrowbody version is in the works, but I want to focus on the regular one first. There will be a door between the driver and cargo area.
From what I saw in images online, it depends on the coachbuilder. Some of the images I saw had a passthrough to the cabin, some of them didn't. The MD-Series does seem pretty accurate with the window to the back of the truck, though.