Hilary is correct, a full scale drawing would help, I go a bit further, set in a set of wheels without tires, as tires are not perfect and I use a CAD program to check the geometry for truthfulness, quicker than a drawing. A number of cheap CAD programs out there, cheaper than buying drafting tools even.

Having sold Raleigh's long ago, there is a transition point somewhere in the mid 70's where the geometry did change, and frames of different size seat tubes shared a top tube length, great for a rider wanting to sit up more upright and not reach as much, not so good to get a typical fit. We guessed it just made for faster production, less parts, less to rejig.

Later they even sent over the Nuovo Record cranksets with chainguards fitted... big brother was watching and had to protect the masses with too much money and no sense.