HAHA - The Fuso has the turning radius of a jeep but fuel economy...not so much. There are always trade-offs. One of the reasons we are considering this move is to lower the climb into both the cab and the camper. To keep the flatbed height as low as possible we would want to cut a fender into the flatbed similar to what you did in your shell. Can you tell me how much you allowed for larger tires and suspension travel? Mitsubishi/Fuso published a great upfitters guide that has all this info but I haven't been able to find a similar source from Ford.
Here's a crude concept of what I am thinking. Scale is very approximate but the roof on the camper is 13-'6" and the height of the camper with the top down is almost exactly the same as the frame to cab top of the transit so it would be taller than the the cab by the thickness of the flatbed which is dependent on the allowance for the wheel well. The other option is a lift and what I am finding on the market assuming that a Transit van lift would work on the cab chassis is 2" which would help the clearance by allowing taller tires...but defeats the keep the climb height down goal. Trade-offs!
This photo is a cut and paste from the Fuso so tire size of the spare behind the cab is significantly bigger that the transit. Since the Transit spare fits in the frame I wouldn't need to put the spare behind the cab. I would move the tunnel box directly behind the cab and make the bike garage (the teak doors) bigger. I sure like that nice stiff flat frame as a foundation to build on.
ps. Some eagle eyed reader will notice that this photo is of the left side of the camper and the right side of a Transit. I'm 300 miles away from my truck while I am contemplating this so I grabbed what I had on my laptop and flipped it. Cut me some slack.
I'll move this to a new thread if I move forward with this so I don't hijack yours. Thanks for your help with info on the Transit. Congrats on your great build!
Buckstopper