Prepare:

1. order parts
2. print parts

Build:

Lower ring

1. Assemble servos
2. Center seros to middle position (with servo controller, or easy sketch: Arduino servo)
3. Add servo horn when servo is aligned
4. Mount vanes one by one . The servo horn (ES9052) fits exactly into the fitting on the wing. I used M3x12mm screws to make a positioning screw on the opposite side.

Upper ring

1. Mount motor first
2. Add screws for the flight controller from "underneath"
3. Fix the flight controller with M3 circuit board spacers

Connection

1. I attached (daisy chained) WS2812b lights on the inside of the drone legs and used them to connect the servo power lines on
2. The signal lines of the servos must definitely be extended
3. Connect Motor and receiver lines to your (betaflight) flight controller (more to betaflight comming up!)

Battery holder

I attached the ESC and receiver on the bottom side with cable ties (there are also the notches in the holder). A standard buzzer will fit into the round of the bat. holder.