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With a flat toptube then you can easily work out the head and seat angles. If you have an iphone, use the angle finder, zero it on the top tube and then you'll get the head and seat angles straight out the phone (watch out for side buttons. My old SE had one perfectly flat side but new 2nd gen SE has buttons on either side).
If you have any cad software or are good with scale drawings you can take those angles, measure all the tubes and draw the basic double diamond shape up, doesn't need any detail, just lines, then you can extend the headtube line down, add in your rake and measure the a2c.
M_V
Sounds good; gonna try that. Thanks! Edit: Hm, you need a bit more info right? For example HA and where it is in space. Or do you mean do this in real life?
@M_V: Bb drop, pretty sure. SA, less sure. Yes, level top tube.