This is second attempt to build quad inspired by FPV cycle Baby tooth 1S. This time weight wen a bit higher.

Unfortunately, I was not able to source the FPV cycle parts. I had to find something to replace them.

I'm using DarwinnFPV AIO Flight controller. It's adwertised as 15A 1S FC.
Engines are soldered directly to the FC. This was mainly due to FlyWoo motors didn't have plugs. Also DarwinFPV AIO is shipped without connectios soldered in.

To be able to access the USB connector without removing the FC from the frame I have flipped FC upside down. After this, you will have to remap motor order and adjust FC orientation in Betaflight. Unfortunatelly you still have to remove the canopy to connect the USB cable.
When designing this quad FlyWoo RB1202.5 11500KV motors was the closest to FPV cycle motors I could buy. I'm using a 1,5mm version. Mainly because there are more propellers on the market.
Motor wires are routed on the "back" of the arms, looking from the propeller spinning direction. This way tey are protected from cutting in flight. In turtle mode you still can demage motor wires.

To have this build as compact as possible I have Happy Model EP2 ELRS receiver.

I'm using XT30 for better conductivity. You need to change the plug on the battery fomr PH2.0 to XT30. I didn't found any 1S 450mAh or 650mAh battery with XT30.

For the canopy I'm using FEICHAO Camera Canopy for Mobula 6 HD canopy. I have designed adapter for Caddx Ant Lite camera. I find this canopy to be the most durable for me.

I'm using the TBS Unify 32PRO nano VTX. The cammera is powered from the VTX passthough pins. Video signal and Smart Audio are connected directly to the FC. The TBS Unify uses so mush current that I'm not able to fly on max power. I got some strange noice in the video feed. This is not much of a problem. I'm mostly using the 100mW setting.

Whole drone weight is 51g without the battery.