Yup. Cool planes.
Not only have I seen one up close, I was lucky enough to watch them do a ammo reload on the front gatling cannon at EAA. Big rounds! IIRC, they had to reduce the rate-of-fire of the cannon because the rounds depleted the oxygen enough to snuff one (or more?) engine.My Dad used to watch them making practice runs at Volk Airfield and he described the "farting noise" as they shot at ground targets.
Cooler yet, a friend of mine used to fly 'em. Must have been a gas, but still, he always said a P-51 was his all-time favorite. - RIP, D.C.

It is better to go skiing and think of God, than go to church and think of sport. Fridjof Nansen
I hope to die in my ski boots... ...just not today. Me