Hi Mark, you’re absolutely right, Vcarve v.8 has the newly-incorporated import 3d model tool which slipped by me so I will get on updating the documentation to reflect that today. I am not familiar with DeskProto myself, but I believe most of the functionality you would want for projects using the accessory could be found between Vectric software and Fusion.
At the moment there are two approaches to using Fusion 360 with the accessory. The first, as you mentioned would be to bring the model you would like to machine to a specific, non-90 degree orientation, which is beyond the capabilities of the import 3d model tool in Aspire and Vcarve (Teacup 1 attachment).
So if we open Fusion and upload the .stl of our model (I’ll use the teacup example again)
Right click your model and select Save as STL, and download and export the .stl to Meshmixer (Teacup 2)
In Meshmixer it is possible to rotate your model by selecting edit, and just typing in your desired rotation angles (there are some other useful tools worth exploring here too)
And finally you can just export from Meshmixer and re-import into your Vectric software (and as a future note Meshmixer will eventually be incorporated into Fusion itself)
The second way to use Fusion would be to use the CAM workspace to fully toolpath your part with a model of your stock and the accessory itself for reference. This would be useful as it would allow you to dynamically rotate the stock on the accessory itself using joints for example and would simplify the zeroing process. I haven’t actually gone this route yet for the Manual +2, just because I am more familiar with toolpathing in Aspire, but I've added a .step model of the accessory that could be imported into Fusion to the blog post if you'd be interested in downloading it and experimenting more. I will likely play around with it as well in the future.
Hope that helps and let me know if you've got any other questions!
David