Very good Andreas,
I have also done the Stab adjuster Modification, but this week completed the wing adjuster modification as well. I was pretty straightforward. Very little work required to the plane. The front adjusters are placed so the male portion is in the fuselage, and the rear adjusters are place with male portion in the wing. The female sockets are easiest to install in the original front wing pin, and the rear fuselage sockets.
To place the front sockets, I wrapped them with a few turns of paper so they would friction fit in the wing pins (that I cut off), then applied a small amopunt of thin CA to soak the paper/socket. The rear sockets I left until the last, so that they would be positioned naturally. Some epoxy on the socket froze the location and position of the rear sockets...then I was able to fill the empty space with balsa and filler.
I set the adjusters so the wing would be at +0.25 degrees to the motor with full "bottom" adjustment. This allows me to put the wing anywhere from +0.25 degrees to +2 degrees. Currently, my plane is set at engine=0 degrees, wing= 0.5 degrees, and stab at zero degrees. This close to all other planes I have owned and in the same ball park of other Integrals that do not fly the stock settings. Trimming procedure continues...

John