I love the concept. It's a great way to visualize 3d graphics and an excellent idea for a self portrait.
The cleanliness and perfect symmetry of the face, even though it is still under construction, makes me more aware of the fact that it is a digital face and that the right half is just a mirror duplication of the right half. To make the face fit in with the workers I would have the face be asymmetrical. Perhaps one half has more or some areas are more complete/detailed so that it looks like it's currently being affected by the workers. Great work.

PS: (Sketchup was first released in the 2000, and Grüter's models were uploaded in 2009) Share sources in your description. I know you weren't trying to, but it can look like you're trying to take credit for other's work. Good luck!