I'm glad that I'm not the only one to transpose these model numbers!!
Just to keep the thing on the boil, my main need is to scan some MRIs, and I had given up trying to use the small window in the 3170's mask. Without the white dots on the mask it does not know what to do. So making a mask is dificult, and it may only have three options on the scan area as there are only three masks with the unit. I doubt that it could be 'ordered' to go outside the normal areas.
However, I tried my own idea of snapping the $1,000 piece of plasic, and it's the best copy I've ever got. I used the light in the lid as a light table, and held the camera. I'm now setting about getting the tripod set up and a large light source. When I've done this I'll try some of the more fun items.