Follow steps to solder connections:

• Attached OLED wing to Feather using soldering notes provided by Adafruit.  Really needed a third hand.  My result is that the wing is slightly off parallel.  The side away from USB is slightly closer to the Feather.  This became beneficial as the 2mm screws available where only 6mm long.  This is not long enough to reach through both boards and into the enclosure if the board are parallel as they should be.
• Soldered wires for LED strip and environmental board after the Wing and Feather connection was completed.  This was tricky to thread them between the two boards and up into the correct connections in the Feather board, but doable.  Used solid core 22 awg, With stranded wire it would have been a major pain.  Next time would recommend trying 24 awg.  22 awg seems like over kill.

After making all connections, I was not able to successfully use the LED strip.  After some head scratching, I realized that I had connected the digital signal line to A4 on the Feather.  Turns out this is an INPUT only pin.  Duh.  So removed and soldered into A5.  Ops Chk OK!