First I take a blank PCB and put 1x4 header in the BME position and two 1x8 headers in the outer ESP8266 mounting positions
Next I place another blank PCB over to make a sandwich, keeping the loose headers in alignment, then flip the combination over to solder the bottom side.
Inspection after soldering
Then the top blank PCB is removed and I put the ESP8266 module in place and solder it down and trim the header leads with flush cutters
Next the BME280 breakout is soldered down
A round milled 1x4 header is soldered in place as a mounting point for the OLED module but this is left as a mating pair not soldered in place.
Two 6x6x6 momentary buttons are soldered down and the completed PCB assembly is screwed down to the Hammond 1551V2WH base plate
I put the cover on and use flush cutters to cut out two pieces so there is an opening for the micro USB cable end
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