Things to do: (
= DONE)1. Design PCB
* transcribe schematic into a CAD package
* lay out a board
* do
* make countless tiny alterations to board
* until happy
2. Make a protoype board
* identify components
* adjust layout according to available parts
* optional: return to step 1 to update board
* if a trivial change then skip this step after changes
3. Send board for manufacture
* if count < 10
* use Seeed fusion prototype service
* else
* find another supplier
4. Assemble parts inventory for kits.
5. Make kits.
6. Sell kits.
I am most of the way through part 2. As Lardo B. has parts on order I'll send him a home-made board for stage 2 protoyping. If it works I'll progress stage 3. I may want some cash up front if not using Seeed.
I'll be honest with you, I don't want to do 4, 5 or 6. Also I wouldn't expect anyone to have to do this without $£$ input, so we'll have to come up with a plan to make this happen. This will perhaps work in conjunction with step 6.
Anyone on board? (no pun intended)
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) but am happy to have a go at assembling one. I still need a couple of bits such as a case and cables (and batteries!) but they are easy enough to get. 
)