I have managed to get most of the components - resistors, coils, capacitors, ICs - from Spectrum Communications. But had difficulty finding a source for the 14230kHz crystals. Now I have made a contact through ICM-Crystals with Chris Emmerson
Let's see how delivery goes...
In the mean time, here's the board with most components mounted:
I have left off two resistors that were connected from the LM386 inputs to ground because this IC has internal bias resistors and they are unnecessary. I have also substituted the input MOSFET for a BF245A, and lowered the load resistor to 1K to maintain the drain at 4-4.5V with zero source resistor.
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