This is the BDR Iris 4'' from Stephane SEGATO.
A small, HD, agile, very powerfull drone.
Freestyle is the target. But long range is also possible with more than 4 minutes fly time in freestyle, and GPS.
PID are perfectly tuned now. Check pictures.

3D parts :
GPS+buzzer+antenna mout : https://www.thingiverse.com/thing:6000252
Vista antenna mount : https://www.thingiverse.com/thing:5628025
GPS mount : https://www.thingiverse.com/thing:5628039

Reference build is : https://rotorbuilds.com/build/23197

FC : AIO, F7, 40A, 2-6S, 20x20mm, 41.5x32.5mm
This F7 FC is maybe overkill. I think an F4 FC could be enought.
Alternative 1 : https://www.banggood.com/F4-Zeus-Flytower-STM32-F405-Flight-Controller-AIO-OSD-BEC-PDB-Black-Box-15A-BLheli_S-4-In-1-ESC-p-1197756.html?p=3F201911077692015010
Alternative 2 : https://www.banggood.com/F4-Zeus-Flytower-STM32-F405-Flight-Controller-AIO-OSD-BEC-PDB-Black-Box-15A-BLheli_S-4-In-1-ESC-p-1197756.html?p=3F201911077692015010