Taildragger - if your read one of my earlier posts - I answered that question about the RAF.
They started with 4 leased, and are now buying them outright, plus two more (I understand it's been reported open-source).
And Yes, a Chinook will fit. You have to remove the forward and aft rotors, hubs, gearboxes and any pylons, and store the blades and fwd pylon/gearbox inside the helo. Also still have room for a Landrover 110, the 15T crane to re-assemble the Helo, and 43 personnel.
I have a copy of the Boeing booklets on US Military Loads and Pacific Nations Military Loads Cargo Compartment Versatility books if anyone wants to have a look..........