Sharp research Robert! Friderici also had the normal sleepers so I assume your house-made one
has more to do with storage room for belts, chains, tarpaulins, and possibly a bunk upstairs for
overnight stays. Also this sort of cabs can easily be removed when sold or change of transports.
A-J
Attached the picture of Alex

You are right A-J, and Friderici even had Henschals with the normal sleeper cab, like this one! Robert 
@Robert…in all fairness, I strongly doubt this is an original Henschel-cab. More likely a Wackenhut
(German body-specialist) and also it looks a lot on the Büssing-version from the sideview. No idea
if this vehicle was transformed to the 2.30m width so long required in Switzerland.
ERF-Continental:
@Robert…in all fairness, I strongly doubt this is an original Henschel-cab. More likely a Wackenhut
(German body-specialist) and also it looks a lot on the Büssing-version from the sideview. No idea
if this vehicle was transformed to the 2.30m width so long required in Switzerland.
I agree. At first I thought it was a Bussing with a funny radiator! The heavy-duty vehicle was probably a one-off all round. Robert 
For those who are especially interested in the three circles, herewith a front/back of a 1958 spec with
some heavy construction types. K stands for tipper, W for widder, E for Elch, AK for four-wheel-drive,
B for büffel, Dr for drache…for the real die hard enthousiast I will scan some quarry-dumpers later.
robert1952:
You are right A-J, and Friderici even had Henschals with the normal sleeper cab, like this one! Robert 
0
That’s not a Henschel cab. It looks a bit like some Fauns or ÖAFs. I wonder who built the cab?
robert1952:
You are right A-J, and Friderici even had Henschals with the normal sleeper cab, like this one! Robert 
Attached some evidence on the Büssing-cab…

ERF-Continental:
Your special MB is a Henschel F320AK as per attached spec
Thanks for the info ERF-C. It seems Germany went through the same sort of thing Britain did, where lots of marques (many of them with a long and distinguished history) were swallowed up by one or two major manufacturers.