When I mated the wings to the fuselage for the first time, I also wanted to drill the holes for the nut-plates on the wing inboard rib edges. As noted, the fairings did not come with the fuselage kit. I had spoken to Van's about this some number of years ago...but it looks like they chose not to send them with the fus kit.
My "solution" at the time was to order a large sheet of aluminum from ACS and fabricate my own. I used the manufactured edge of the sheet as the "outside" edge and trimmed the inside edge for a uniform 1/16in gap. At the time, I assumed that the left over aluminum would get used elsewhere (I'm great at needing to fabricate two of everything I touch), but I haven't needed to use any of the left overs from that big sheet.
My observation on RV's that I have seen in my neck of the woods...those that match drilled the wing gap faring and then installed the plate-nuts after removing the wings looked the best. Those that drilled the holes for the plate-nuts on the wing first, and then later tried to match drill the holes in the gap fairings later (finish kit parts) had "puckers" in the gap fairings between the dimpled screw holes. Just something to think about...