SC:FA scales - just for consideration

[Plasma_Wolf]

Time for a double post now that I've managed to crack the numbers properly:

I still had a screenshot of some units when the old db was still online and a small cut of the image is attached. You can see that the height (second size number) is 6.5, which says 127m.
That means that a a unit (1) equals 19,5384615384615m.
If we determine the unit with the map sizes, we get divide 10000 by 512 to get exactly the same number. Now that we have the unit, we can determinte the actual numbers, by checking the direct blueprints.

The ACU (Seraphim/Cybran): 2.2 (42.98m)
The ACU (Aeon/UEF): 2 (39.08m)
The Mech Marine: 0.6 (11.72m)
The CZAR's diameter: 21 (410.3m)

The SizeY values of the Ylona Oss and Mavor I found were 2.2 and 2 resp., which I can explain for the mavor (only when it's packed/under construction, not when the gun is active) but I don't know the reason for the Ylona Oss. I could try to determine the actual size by the image the OP made but the factor he's off for the GC is 1.3, while he's off by a factor of 1.6 for the UEF ACU and only a factor 1.1 for the CZAR, so it's impossible to do so.