It is easier, Just don't expect the same results with over 10% less power and with more weight than the engine, radiator, prop from the base line MK IX.
Weight is rarely of a concern for the top speed. Drag is cruel (copyright
![drgondog](/forum/data/avatars/s/3/3324.jpg?1151540493)
I don't expect 445 mph, more likely 420 mph on a basic Mk.IX fuelage, and up to 430 mph with retractable taiwheel and covered wheel wells.