@sindarius - Firstly, what you have produced so far is BRILLIANT!! Well done sir 
I absolutely love it!!
Secondly - have you had any time to look into / work on, the idea of a plugin for the XYZ probe used on the Workbee? The DWC used by Ooznest was great for the inclusion of the automated probe setup/use, but the rest of the UI was so heavily "printer based" that I hated it.
Your CNC version, is "the dog's wotsits". If "their" probe setup (or similar) could be added to "yours" as a plugin - SO many people would be extremely pleased.
Thoughts - for future development ........., your gcode viewer is good. Before having to use/learn Duet, I used Universal Gcode Sender - the feature that I love in that, is seeing the toolpaths, and a representation of the tool tip - in real time as the cut progresses. It certainly gives me reassurance as to what the machine is doing/about to do. So a possible plugin for that would be uber cool!!!!
Many thanks - keep up your great work