There are no public documents for Groom Lake. In fact, even the known aviation fixes are not publish. From a FOIA request I made to the FAA, the fixes
have reserved names so that there is no confusion with published fixes. but the FAA doesn't have (or claims not to have) the actual fixes. Note that
you can't even get approach/departure data for the Tonopah Test Range, which is far less secret.
I made that kmz by creating routes in a mapping program. There are different colors for each route. The colors have no significance. The data is from
the FAA SUA.