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Apparently the steering linkage isn't so unique, Retrovelo have been using it as well.
Come to think of it so has Batman on one of his motorcycles (or maybe not and I'm just imagining that).It looks rad and all and definitely could carry some light weight stuff but I doubt it could haul the same load a Bullitt could.
Flexibility and a slopping cargo area aren't the best qualities of a cargo bike. And couplers?
Catan titanium Cargobike, a lightweight Sport Utility Vehicle...hmmm
Some steering linkage inspiration for you @Hulsroy in case you wanna try out something a bit different (and use 5 headsets).