Thanks, Henrik.
I had already found the schematic and then I also found a PDF with the shield outline and dimensions. Both are attached to my last response to Bruce in this section along with a link to where I found the dimensioned drawing where there's also a link to an even lower cost Arduino clone for 18 or 28 pin PIC or PICAXE.
The EM500 shield will have minimal connections to the main board - I think 3.3V, GND, RX, TX re all that are needed. (I may find more once I'm fully awake - I was up well past my bedtime last night.) The site I referenced in the other thread mentioned a new 5V version of the chip, also.
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