The flat cable I had in mind as an option is in fact 10cm long, and the prototype unit has 50cm leads. These could be extended to a meter or so, but I'd be a little hesitant about going much over that.

PS: How many beta builders did you pick? Do they know yet?

There are five or six, and in a couple of cases it may be a pleasant surprise when they get their call-up papers

Patrick
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Experience is what you get just after it would have helped...