To be more diplomatic than the other commenter here - this is not like a parabolic reflector like the Briese system. The light would have to be positioned near the front face, aimed back into the umbrella with the added ability to focus the light. The Light Dome 150 is simply a circular softbox. It's useful that it's a perfect circle compared to an octa, but that's about it.
They offer a full mobile projection and color correction suite that seats 8. 10k per week for that seems pretty reasonable...
I think you're spot on. These are a great match for the a7c. The aperture ring really seems to be there to make up for the lack of a front dial on that camera. The only film making application these seem suited for is drone work - which they would be killer for!
I've read they use the 24-70 GM so that's 2.2k right there. With a nice high brightness monitor and long range transmitter, 10k almost sounds low to me
The autofocus system on the A7rIV is quite a bit better than previous iterations. I believe the A9II has it and the A7sIII has the same system with twice the processing power which helps support its 120p autofocus performance.
I upgraded from the original A7 to the A7rIV and my old lens on the new body is lightning fast now
I'd pay $100 for that criterion release