other cradle designs
I am proud to see that both the velvet and the acrylic cradle can not match my design in terms of precision positioning and flexibility. You can add a soft padding to my v-cradle panels if you wish. With my new improvement (four regulated bolt legs) my v-cradle will allow to change horizontal and vertical angles to any precision required without touching the tripod. And it allows you to shoot very fast without adjusting the postion for every page. Instead of glass you can use your fingers or a clip or a transparent strap.
If I had a few thousand bucks to spend, I would buy an Atiz two camera v-cradle, but my design does the same (with less automation), with more precision and flexibility.