BOM -

• 2 x cheap "esp-12 adapter" white boards
• 16 x pogo pins
• pin headers
• a piece of FR4 one-sided board
• double-sided proto board (off the shelf part)
• kapton tape

Steps to create -

• First board:
  • desolder the resistors on the bottom of the board
  • stick kapton tape on left-side holes of a white board
  • solder 8 pogo pins to right-side pads of the board
  • align and re-solder pins as precise as possible
  • TEST CONTINUITY! And avoid any bridges.
  • cover the left-side pogo pins above the left-side pads with flux
  • solder the left-side pads by adding a bit of solder on top of pogos
  • solder a pin header to left-side VCC hole on the bottom
  • solder pin headers to right-side holes
  • TEST CONTINUITY AGAIN! Yes, again.
• Second board:
  • desolder the resistors on the bottom of the board
  • stick kapton tape on right-side holes of a white board
  • solder 8 pogo pins to left-side esp-12 pads of the board
  • align and re-solder pins as precise as possible
  • TEST CONTINUITY! And avoid any bridges.
  • cover the right-side pogo pins above the right-side pads with flux
  • solder the right-side pads by adding a bit of solder on top of pogos
  • solder a pin header to right-side GND hole on the bottom
  • solder pin headers to left-side holes (reset .. vcc)
  • ** solder the VCC pin to the right pad of the desoldered resistor
  • TEST CONTINUITY AGAIN! Yes, again.
• cut-out a piece of perf. board so that 10 pins are available in the space between the two white boards -- TEST with your pogo pins first.
• remove plastic headers from bottom of pogo pins on the white boards
• push through the pins to the single-side of perf. board that has copper
• solder white boards to be flush (especially on the single header pin side) with the perf. board
• re-inforce the bottom side of the board with a double-sided proto board
  • stick some pin headers and solder to give it a good grip on the bottom of the single-sided board.
• add pin headers on the sides and bridge these on the bottom with headers connected to white boards
• TEST CONTINUITY!
• cut off any protruding pins
• ENJOY!