Insert an M3 screw into the mounting hole in the tentacle base.

Attach the case box to the tentacle base using an M3 nut.

Place the case lid on top of the Feather so that the buttons and TFT slot into their cutout areas.

Attach the left side of the Feather (side with the three buttons) to the lid using M2.5 hardware.

Attach the right side of the Feather (side with the reset button) to the lid using M2 hardware.

Close the case by snapping the lid onto the case box.

That completes the assembly! You can power the Feather over USB or with a battery connected to the JST-PH battery port.