Looking t that diagram it certainly illustrates how much extra weight the Sterling had to carry a round to deliver fewer bombs -a large part of it in the wheels alone which look enormous and of course it does look extremely ungainly on the ground and must have been a nightmare to land with that extreme deck angle. The Lanc and Halifax look almost exactly the same so where does the Lancs advantage come in there-I think there we some Merlin Halifaxes so perhaps it was structural weight for same bomb load ?
With their Provincial city naming scheme its a shame they didnt find a way to give one an extremely Welsh name so that German fighter controllers couldnt say it perhaps a Vickers Llanelli