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In simplest terms, the NEC prohibits the ground wire from being used as a current carrying conductor. When it is bonded to the neutral at the receptacle, it becomes one (in parallel) with the neutral, carrying current back to the generator. John

Since the neutral can carry voltage, you don;t want them bonded anywhere except the first point of service, in this case the generator. Otherwise you will create a condition in which your ground conductor could carry transient voltage and under the right circumstances, a number of bad things...

Jim, that looks nice. A couple observations though...it looks like the ground and neutral are bonded on the receptacle on the right. If they are, they shouldn't be. I would however, run a ground wire and bond to the metal box and the so cord ground. John