Summary

Note: The original had the wrong motor hole pattern for modern 0603/0702/0802 motors, and the center hole was nowhere near enough for the c-clip usually found on these motors.

This build is quite tight on space and probably not recommended for beginners. Or anyone who is uncomfortable soldering very precisely.

Frame is printed in PLA with 0.12mm resolution, 100% infill

Camera holder, Receiver cover is printed in 95A TPU with Prusa Slicer's 0.16mm Dynamic quality, use supports for the receiver cover.

M2x12 screws, 2 need to be countersunk to make room for the Flight controller.

Flight controller: Teeny F3, though if you have the Teeny F4 that should work too. The USB plug and ESC plug slot in neatly in the gaps in the frame. I got mine here: https://www.xt-xinte.com/Teeny1S-F3-16-16mm-Betaflight-STM32F3-OSD-BEC-Flight-Control-Board-for-RC-Drone-Quadcopter-p147310.html?parent_user_id=1420080&utm_source=sns_share&utm_medium=share_line

ESC: Tiny Pepper 4in1, though you wont find that sold anywhere anymore. Racerstar shamelessly copied that design, and this is still available at some stores, such as here:
https://speedyfpv.com/products/16x16mm-racerstar-star4-4a-1s-blheli_s-4-in-1-esc-d-shot-600-for-micro-drones
(again, this was selected for size, many 16x16 ESCs go well past the 20x20mm dimensions. Also if using the Racerstar ESC, you need to remove the sticker, heat shrink and desolder the motor connectors (BE CAREFUL, its easy to lift those pads), so you can solder on the ESC connector from the FC.

Camera: I used a 199C but you could also use a Tinywhoop.com Pinch camera
https://www.xt-xinte.com/LDARC-199C-Mini-Camera-for-TINY-6X-FPV-Racing-Drone-RC-Racer-Quadcopter-1-9g-p456873.html?parent_user_id=1420080&utm_source=sns_share&utm_medium=share_line

RX: SP24S, its actually a tiny bit bigger than the EP2, so either will fit
https://www.xt-xinte.com/2-4G-ExpressLRS-EP24S-SP24S-Long-Range-Receiver-MINI-RX-ESP8285-MCU-SX1280IMLTRT-RF-For-FPV-Racing-Drone-Tinywhoop-p940601.html?parent_user_id=1420080&utm_source=sns_share&utm_medium=share_line

Motors are 0603 16000kv but they are too weak for my liking. I would go with some higher kv 0702, 0802 etc. These would be awesome on it!
https://www.tinywhoop.com/collections/motors/products/copy-of-802-27000kv-tiny-whoop-danger-onesies-brushless-motors-bottle-rockets

Vtx was a 25mw I pulled off the back of an AIO camera. You have some horizontal space to improvise with what you have there but probably will be tough to fit a ufl connector in there too (not impossible, I'm sure)