@ flying lawyer and markerinbound.
Sorry - "CF" was a typo for "CPL (Commerical pilot's license)" - having just typed "CFI" for a flight instructor rating, my mind burped.
I did think my description of the enhanced requirements for the aircraft itself was adequate shorthand for the requirements of Part 135 - IN THE CONTEXT of answering a question from a non-technical non-pilot with likely little idea of what "Part 135" or "Part 119" could possibly mean.
I.E. it can't just be a private plane off the flight line...it must meet more demanding regulations.
The NET thrust of my response was that his planned adventure would run into significant regulatory problems and be very expensive.
Anyone actually disagree with that?