The only limit is the 35KT cap for Aerodynes, but a Spheroid can indeed go to 100. And land and take off, if it has sufficient thrust, despite what some folks on the forums might believe.
That said, the idea of a proper Leopard gunship would be amusing. Not the pee-whiz of 3075, but just pulling one or two mech bays for cargo and armor tonnage, the other four bays for guns, fire control, crew, and ammo.