1 ... 1 x kick drum, 1 x snare, 1 x rack tom, 1 x floor tom, 1 x hi-hat, 1 x crash, 1 x ride, stool, sticks, brushes - that's plenty.
2 ... 2 x metronomes, 1 x digital, 1 x personal.
3 ... a sense of musicality.
... and if I recall correctly, Peerless also made parts for Duesenberg - there being some similarities between the Retromatics and the Duesenbergs.
Spot the similarities ...