Re: Hyper Beluga
You could get the wings of the A380 in it for a start.
However the main restriction to a plane this size is the runways of the Airbus factories.
Hamburg and Toulouse handle the A380 already and most are in open countryside so could be extended.
The fly in the ointment is Broughton where the runway is bounded by a main road at one end and a railway at the other. It's also quite narrow.
These planes, although big, don't carry much weight so only need 2 engines.