Man, you are a brave soul. I admire your courage. Open post for comments and suggestions. lol
I will add to some great suggestions you have been given already. Some I will repeat for impact.
My OPINION:
Good start
Get in touch with DrJones for a driver?
Perhaps: Fully potted electronics???
You scare me with the 5 mode part. I don't like strobes or blinkies. Again, my opinion. If I have to cycle through those modes to turn off light, I will be very unhappy (picky) fellow.
Easy to disassemble & repair. For those of us who like swapping leds and drivers as tech changes.
Clip? Need something to keep it from rolling out of reach or into trouble.
If you do a clip, make it like a knife, where it can be carried bezel up or down! No need to worry about lefties here! ha!
Finishes: Natural, and bead blasted or tumbled. I love bead blasted, some think it shows snails too bad. But not me. Also, offer a anodized option to some parts.
Carbon fiber to me should only be natural. High quality only.
Lens, AR Ultra clear
Your ring mount should be sturdy and large enough to fit a quality heavy duty stainless split ring (like those used on fishing lures). Still that may no be enough anti roll? I could be wrong? Often, when I put the light down, I want it to stay where I put it.
Please, please offer Neutral White as a Led option.
Price/Cost/ROI:
What I would pay is unknown at this time. What others would pay is even further unknown.
I would be concerned with my Return On Investment. So that would need to be forecast. Your time involved in getting all parts, assembly, testing, sale list & monitoring, sale transaction completion, updates, packaging, shipping, International shipping, returns, DOA/problem units, after sale replacement parts & servicing. Then dealing with just plain crazies emails & problems. So I guess, what is your time worth to you? What ROI is necessary?
Hope that helps. I wish you the best of luck in this endeavor.