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The most accurate and simple way of finding the balance point is to simply cut a broomstick or board to the same length as your planned OTA, and then just hang your stuff from it: Primary mirror on one end, and focuser, secondary etc on the other. Then hang the whole thing on a nail and find the balance point. Then you can measure the distances correctly.
The point of the Serrurier design is that the two halves have to be balanced. There is no particular ratio of truss lengths, it only depends on the weight of your optics etc in the two halves of the OTA. I'm not sure what my ratio is but I'm pretty certain it's different from Brents' since it's very individual.
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