Lightning, Mustang, Mirage with abnormal number of engines

[Tophe]

There were also single-boom 3-engined push-pull Mustangs but they failed to reach success:

[Tophe]

The major Mustangs with single boom had no lateral engines:

[Tophe]

The biplane version of the Mustang had increased maneuverability but required an additional little engine (because of the bigger aerodynamic drag):

[Tophe]

Fighters with 4 piston engines were very rare, maybe this Mustang prototype was the only one ever...:

[Tophe]

The Tri-Stang of PR19_Kit (at https://www.whatifmodellers.com/index.php?topic=37049.180 ) was a P-82 with 3 tractor engines,
and my Triplestang below is a P-51 with 3 push-pull engines:

[Tophe]

Becoming triplex-boom, the Lightning had room for many engines:

[Tophe]

Mustangs were mainly twin-engine single-seaters

Some rare Mustangs were featuring 3 little engines, this was very safe:

[Tophe]

In "fact" (I must tell you "The Truth"): the Trislander was a derivative of Mustangs, here are the missing links with passengers:

[Tophe]

The P-51AT used a little extra engine as pusher for anti torque reason, with high success:

[Tophe]

In 1971, the only twin-engined biplane reaching Mach 2 was a Mirage:

Despite its long range, no order came, and the taxpayers smiled...

[Tophe]

The twin-engined Mirage 5X-3 was very sharp but failed to become supersonic...

[PR19_Kit]

Looks like a baby Mirage IV.

[Tophe]

Thanks Kit!

[PR19_Kit]

Now there's a thought...…

The Mirage IV has a very wide rear decking as it's twin engined, and twin fins would suit it very well. It'd look like a manned Navaho missile even!

And I have TWO Mirage IV kits in The Loft at home as well. 

[Tophe]

Uh, thanks to remind me the twin-fin version of the Mirage IV:

But this one has 3 engines side by side, even it cannot be seen from this angle (or is this a requirement of this GB?)