We have a vive and Rift here with some sketching programs. The Google one is really fun to mess around with. However, it is really difficult to get straight lines or anything that doesnt look like a 7 year old made it. It is amazing how much more difficult sketching becomes when you add in another dimension. However, like basic sketching, I think that with enough time you could get decent at it. Shoulder fatigue is something that is fairly common after about 10 minutes as well. I am curios as to how they are outputting this into a CAD file. The technology is going to have to develop a certain interpolation to straighten or fix rough edges and fill in surfaces.