We don’t have official, canon, heights for ‘Mechs, vehicles, etc.
The only thing definitive is that they are 2 levels tall in-game.
The Goliath and Scorpion miniatures would 46.5mm and 27mm respectively. The scale is set to 1/265, so from there you could get guesstimates of how tall they should be, if we had canon measurements at this time.
