Made the Sonex-recommended landing gear location tool, which is a jig that fits against the bottom of the fuselage and located the landing gear legs at the proper angles.
I located the mount holes using the plans to draw the location lines on the lower fuselage. The holes were initially pilot drilled 1/8", then a step drill bit was used to enlarge the holes to 7/8". Then the hole was enlarged using a Dremel tool, and finished with sandpaper and Scotch-Brite pads.