I think there may be some tools around to help you in the procedure, you may try to search them with keywords on RTW modding sites. My way is always the basic one: In the rare cases when i do not work on my own custom sets, I import the .cas file of the underlay for the given set into a 3d editor and check there. Beware that (at least with 3dmax) the coords may be 180 degrees rotated (e.g. both voords must have the opposite "-" value added).
There is one other tool I use sometimes, its the Settlement exporter by SigniferOne. It can be useful to trace some objects' coords at once after you put them in your 3dmax model.
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