I decided to start using Simpleplanes again so here is what I have built. It is a P-51 A but it has some of the later model characteristics. It flys well, not too overpowered. I thought it turned out pretty good. Share your thoughts in the comments!

Features:
Full functional cockpit
Custom Landing gear
Flaps

Controls:

1-turn on lights and engine
Vtol-Flaps
G-gear

P-51 General History (Wikipedia):
The North American Aviation P-51 Mustang is an American long-range, single-seat fighter and fighter-bomber used during World War II and the Korean War, among other conflicts. The Mustang was designed in 1940 by North American Aviation (NAA) in response to a requirement of the British Purchasing Commission. The Purchasing Commission approached North American Aviation to build Curtiss P-40 fighters under license for the Royal Air Force (RAF). Rather than build an old design from another company, North American Aviation proposed the design and production of a more modern fighter. The prototype NA-73X airframe was rolled out on 9 September 1940, 102 days after the contract was signed, and first flew on 26 October.
More at: https://en.wikipedia.org/wiki/NorthAmericanP-51_Mustang

I also might make a more detailed version in the future.