Yes, very nice work, @dbmoura!
I am working on a Sketchup model as well. A couple of minor points: the cradle book plate as shown in your drawing has notches on both ends (should only be on one end, at least from the plans that ron posted). I believe the notch is intended as a relief for the spine of the book and should be facing upwards; and there should also be a slot in the cradle that isn't in your drawing, which I believe is intended to provide relief for magazines and booklets that don't have a spine. Again, my apologies if I am wrong, and that is why we model things in the first place, to get all the kinks worked out.
The other concern(s) that I have is this: the pocket for the light fixture in the lighting module does nothing while it is pointing upward. I think it is intended to mount the fixture from the inside of the book scanner, so that when the lighting module is placed at the bottom of the scanner for scanning magazines and booklets there is a flat surface to support the weight of the book scanner. Thinking along those lines, it would seem to be more secure if there were cutouts in the platen module for the lighting module to fit into and lock into place...you sure wouldn't want the platen module to slip off the lighting module while it was inverted. Again, that's why we model these things in the first place.
EDIT: Looking at the pictures of the prototype on page 1, dbmoura's drawing is correct in the way the book cradle is designed. Evidently ron's plans are out of sync and/or represent a later version. Also, I still have questions about the the purpose of the pocket for the lamp fixture...I may end up putting that upper lamp module piece under the supports instead of on top to allow the fixture to remain inside the support when inverted, and adjusting the height of the lamp module legs to correct for the difference in distance...unless I misunderstood the video about the scanner being used inverted? If this is meant to be used inverted for magazines and booklets, then the handle and knuckle relief would be upside down and backwards (resolved by flipping the piece around and backwards?), as well as needing to be counterbalanced in the opposite direction...not to mention the book cradle, which would have to be secured instead of free-floating as it is now, unless the cradle is unnecessary...I think I will presume not to use the cradle inverted.
"Hmmm...I see", said the blind man to his deaf wife...