How to turn a 1985 Ford into a double-faced player piano

Start with a video visualization (click to see animation, courtesy of David, our architect)

This looks about the furthest thing possible from the double-faced god, Janus, much less a double-faced upright piano. But we gotta start somewhere.

The loose-pin hinges make re-mounting the plywood as easy as 1 … 2 …

… 3 …

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