A fellow artist who made a Serett pochade box asked me some pictures of the lid support installation and position.
I installed the end part (with pivot) of lid support to the top part of the pochade box about 1 inch away from the back. With the pivot, it gives about 1 3/4 in away from the back. I then installed a bolt for the wing nut 3 inches away from the back. This makes it possible to open the pochade box to its maximum.