Someone actually built a twin engine, pusher prop, tandem seat plane with minimum instruments for the express purpose of visibility. it was commissioned for National Geographic and it was such a nice plane the put it into production. The Air Cam.
I’ve flown in it. It is remarkably fun airplane.
there are a handful of planes that follow this concept. A Long-EZ is a faster example but the small cockpit comes at a price. The pilot is shoehorned into the plane and there isn’t much real-estate for gauges. Luggage is what you’re wearing.
Putting aside the pusher prop concept or engines on the wings we’re still left with a fuselage that has to accommodate side by side cockpits for the vast majority of planes. While you gain some aerodynamic qualities moving the engine/prop away from the front of the cockpit it still has to taper up to conform to the space needed for pilots. And that still leaves the space needed for radios, transponders and gauges.
What has changed in recent years is the glass cockpit. That allows a savings of space in 2 ways. It allows the relocation of bulk equipment to other parts of the plane and it allows a reduction of gauges through digital displays. It is no long necessary to take up 3 inches for a volt meter or ammeter or any other measuring device when all those gauges can be replaced by a digital display that takes up a fraction of the space. You can now display every monitoring gauge on a single panel that’s 4" square. Navigation and radio can be displayed on an i pad sized unit. All the supporting equipment can be located anywhere in the plane that has space. That’s the future of visibility.