MM,
You should not even be considering moving a hive on your own. It is a two person job. Yes, I know I move a 14 x 12 brood myself, but not a Dartington (nor would I attempt a full plastic Dartington). That is one of the down-sides of the design.
The wooden Dartington does have legs bolted on which (in my cases) are particularly useful as they can double up as handles (they pivot on one bolt to be almost horizontal when swung around to bear on the ends of the body) so 2 people can carry mine between them with little problem. Never tried it yet with a full colony on board - I use the two carry boxes to lighten the load and would never consider moving it with 22 full frames on board. But it is still a pain to move - large, cumbersome, slow job, etc.
It is definitely not a migratory hive. Nor is the omlette. In fact, or in my view, probably the omlett is even less migratory than a Dartington.
I, too, am more into sustainables but the simple point was made to make 'comparisons/alternatives' with the posters original line of thought.
But when I consider that I do use polystyrene for insulation, and that a good polyhive should last in excess of 20 years, it seems a much better use of a piece of expanded polystyrene - than packaging which is made used once and discarded to waste or the amount of insulation I shall use over the lifetime of the hive.
Oh, and remember omlette only supply 4 honey jars, so maybe not expecting the owners to have such a bumper harvest!
Regards, RAB