I LIKE IT!
I wouldnt push for realism on this plane. Its slow, its big, let it carry up to 4 vehicles (have the vehicles up from VH, drive to the giant and then be the gunners on that giant while it flies.. when it lands a .dot command like ".deploy <playername>" from the gunner would smack the gunner into his tank and off he drives out of the giant).
Or something.
But please, do allow a big, slow plane to transport GV's across long distances.