Sorry that you can view some of the links but not others
Here is a link to the directory on box.com containing all the photos linked in the op.
Matt,Thanks and you are correct.
I have a plan to make a more elaborate viewfinder using an SMC Pentax 1:2 55mm ( a 35mm lens) , a ground glass screen, and a 45 degree erecting prism.
I have checked the taking lens and that lens with a tape in range 4 ~6 metre and their scales are accurate, so i would transfer the reading from the VF lens on to the taking lens.
That would allow more accurate focussing close up. Beyonds about 5 metre, my guess is fairly accurate especially above f/11 or so.