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@The_Kindness_of_Trees
How is a 17.5 cm head-tube inconsistent with a 59.5 cm seat-tube? I once measured a bike with a 60 cm seat-tube that had a 17cm head-tube.
That said, the bike in question had a 57.5cm top-tube c-c, but it was a bike of standard proportion.
What I'm thinking is that the 54cm measurement of the top-tube isn't measured c-c: it's the measurement between the head-tube and the seat-post (the picture suggests as much). Ergo, the top-tube could measure 56cm c-c, which would make perfect sense.