British F-20

[kerick]

Four engines, place the wings in an X position, laser cannons on the wing tips?

I may try to draw this F-20Ke if you explain a little more:
are the X xings external of the booms?
or are the booms at the tips of the upper wings?
or else?
 

I was thinking of the double F-5 made to look like a Star Wars X wing fighter.

Mine would probably have looked something like this.

Basis is that the Airfix F-5 is split horizontally just above the bottom line of the fuselage, so two will siamese together.

Intakes are F-4, blended into the F-5 with lots of PSR.

I've used standard wings and tailplanes here, but an alternative would be Mirage deltas.

Twin fins is also a possibility.

double tiger by Harold Smith, on Flickr

My late reply caused the confusion.

[Tophe]

I have not Weaver's source so I will not be the one able to transform it, he will (or not).

I just made the drawing of another Tigershark, with 3 jets this time:

It was not ordered alas, not because too expensive (£ billions is not a problem when it's taxpayers' money…) but because it was not twin-boom, being triplex-boom...