Outdoor windowmount

Our house got a new insulation and new windows.
I wanted to put my outdoorrouter back in place, but drilling was not an option.
So i designed some parts and bought some stuff from the hardware store.

Telescopebar:
https://www.bauhaus.info/teleskopstangen-stiele-/teleskopstange-/p/22261467

Flatbar:
https://www.bauhaus.info/metallprofile-kunststoffprofile/kantoflex-flachstange-/p/10507840?continueUrl=/bleche-profile/c/10000027

Hoseclamp:
https://www.bauhaus.info/installationszubehoer