Thanks for the kind words and advice.
I measured center of axle to top of the seat tube for the height, and center of seat tube to center of head tube for the length. Both came out to 22 inches = 55.8 cm., which is far too long IMO.
I plan to play around with it when I get the chance. I ride 170mm cranks, and a 100mm stem. Such a set up fits perfectly on this older road bike:
