I know that there are multiple ways to attached the access panels on
the wings. Glue them in, clear tape, and etc. I made these screw on
plates to hold them on, incase I need to remove the access panel. The download is enough to support one wing so you would have to print it
twice. The screws are plastic/nylon 6-32 bought at your local hardware store same as the 6-32 nuts that snap into the inside plate. I did make these for the RVJET but could be modified for any wing.

After printed use them for templates to make the cut outs in the
access panel. I used a router bit with a dremel to cut them. Then I
mounted the access panels into the wing and put the template in
the cutouts and used a drill set at about 1 inch and drilled thru the
plates , the access panel, and into the actual wing so I could align
the inside mount plates with the outside mount plates. Once that
was done I used the inside mount plates lined up with the drill holes to make the cutouts. Then I snapped the nuts in the inside plates
and glues them in, glued in the outside plates and then installed the screw(6-32 nylon). Everything lined up nice