Carry a Eurobox or two crates of minearal water in the light balsa sandwich box.
Transport two children on the integrated face-to-face bench without reducing usable box volume.
Simply design and build your individual cargo solution and kickstand from item D30 profiles.
I am convinced, that the forkless cargobike has a great future:
There is one disadvantage, that should be mentioned: With back-rest folded up wind resistance is equivalent to the proverbial shelf unit. It is not a problem in town but can be a bit annoying on an open field in a strong headwind. In a series it could be minimized by producing a bulbous box-lid/backrest, that acts as a deflector.