Unfortunately (for me) the horizontal thrust line is marked with less than 1mm accuracy. But I had to move my engine mount about 7mm below that line otherwise the stand-off would be to close to the top edge of the box. I'm sure I can make it up by tilting the cowling 2.5 degrees down (yes, only 2.5 degrees).

I'm still impressed with the idea of sliding box. I can move it out or if I need I can move it inside (behind the firewall). I don't want to shorten my stand-offs (50 mm) as this is exactly the space I need for ignition module. I will not glue the box until I have cowling cut out and mounted. So I can adjust the engine to the cowling not like it used to be cowling to the engine.

I didn't have much time today, so I only put a blind nuts and I laminated the entire front of the box with one layer of glass cloth and epoxy. This way my mount will have hard surface to stay on. Otherwise under vibration they would cut into the wood. I did the same on my H9 Edge and the mount is solid like new.

The good thing is, the weekend is coming - more time for building and flying (if the weather stays as good as it is now).

RysiuM