Hi Jojomau,
The setup is quite good and gives you a very stable support.
However, the 35mm (equivalent to 70mm in 135mm format in G1)is a bit too long focal length, in my opinion, which needs epecial attention in focus and vibration control. In the G1 system, don't miss the giant killer, its kit lens 14-45mm. It works fine with 30x eyepiece (with some vignetting),The prime lens 20mm is also good. The most important of all, they are auto focus on the 30X eyepiece.
Some suggestion on using manual prime lens in digiscoping,
(1) take away any lens lens protector , UV, Skylight... such thing.
(2) set it infinitive.
(3) set aperture at f4, f5.6.
(4) DON'T focus wide open and then take photo stepe down; use your intended aperture to focus.
(5) use the focus aid of G1 (the image enlarging spot)for critical focus.
CW