My congratulations to Walt, with correct answers in about 4 hours from my quiz posting.
The first Tupolev ANT-20 MAXIM GORKII of 1934 in Soviet Russia was initially built with just six tractor V-12 piston engines, wing mounted, but was found to be under-powered, hence the addition of the upper fuselage mounted pod/pylon holding an additional tractor and tandem pusher V-12 engine. When built, it was the largest aircraft in the world.
It was built solely for celebrating the career of Russian writer Maxim Gorkii (or Gorky) at the urging of the Union of Soviet Writers and Editors for propaganda purposes, and to show the world Russia had built and flown the largest airplane. It was paid for by public subscription and toured the far reaches of the otherwise inaccessible areas of the USSR. There were four smaller auxiliary engines aboard to drive the huge output PA system, and illuminate lights for spelling out propaganda slogans at night.
I am uncertain about the number built; my reference suggests only two. The eight-engine version ANT-20 came to an untimely end when in a group flight demonstration, including a Tupolev ANT-14, an I-5 and a R-5, the Polikarv I-5 Russian fighter attempted a third barrel roll around it, then clipping a wing and downing both aircraft. The fighter pilot, all aboard the ANT-20 and three on the ground perished.
A second ANT-20bis version flew first in 1938. it crashed in 1942 with all 36 aboard killed. It had six larger engines than the ANT-20.
Here are my answers-references may vary somewhat.
1. Andrei Tupolev.
2. Tupolev ANT-20 MAXIM GORKII.
3a. Eight, 3b. Mikulin AM-34FRN V-12 piston engines, 3c. 900 Hp each.
4. All sheet metal corrugated construction for many areas of construction, following the technology of the German Hugo Junker.
5. My sources say just two built.
6. Propaganda.
Specifications
Crew: 8-10 with 72 passengers.
Powerplant: Eight Mikulin AM-34FRN V-12 piston engines 900 Hp each
Wingspan: 206 ft 8 in.
Length: 106 ft 6 in.
Height: 36 ft 11 in.
Weight: 92,595 lbs
Cruise speed: 137 mph
And thanks Walt, for that great photo. I only had black and white ones.