Thanks, Paul. The investigation started when I was unemployed for 6 months and had time to Google everything possible that could work. It is not the most structurally strong (why the need for the bar at the bottom). But it does work. Of course, it is not waterproof. And, what is not shown, I have a 48mm B+W circular polarizer mounted inside the 6x7-to-K adapter.
Would be happy to explain any part of it if someone had questions to build one of these. I needed something that was Bird Walk friendly to my club members. People are important too, you know!
As a side note regarding the whole system concept FWIW, the Pentax K-5II is a great birding camera. Needs no EVF, AF confirm chip, focus peaking, etc. The center-spot red focus light works in manual focus mode and I just fire away at 6 fps in RAW. I am planning (hoping) to buy the 60mm BORG flourite and pair it with this portable concept plus use the 1.7x AFA to allow me partial autofocus (it would have a narrow AF range but it is more than enough for BIF photos). And the red focus light will still work at f/7.65 inside the glass viewfinder. We'll see if I can scrape the money out of my couch cushions.....
Cheers,
B