Takashi-san, thank you for the detailed questions. I am preparing an indicative bill of materials and architecture for you by 12 November, at no charge, as promised. It will rest on clearly stated assumptions.
The answers here replace those assumptions with your real choices, so the costs at 1, 10 and 100 units mean something. Answer what you can and skip the rest; a blank is better than a guess.
At the end you download a short report and email it to me. Nothing is sent from this page.
Sid