This is an attempt to make lightest possible 5" quad, while still retaining good aerodynamics (so no extensive bracing the the propeller flow, internal cable routing, etc.), sufficient stiffness and motors big enough to handle 5" triblades/6" biblades without prop-wash issues.
It flies just great without any problems/vibrations -> https://www.youtube.com/watch?v=vsO9PqrXtQQ&t=23s

It's also surprisingly resilient and already survived one crash without any damage.

Frame is made from 6mm thin-walled (0.5mm) CFRP tubes + 3mm tubes for the support structure - weight of the frame without aerodynamic canopy is just 20g, canopy adds 4g on top of that.

I choosed Skystars koko 2004 1800kv motors with 5.1x2.5x3 props, Caddx Baby Ratel nano-cam (amazing video quality for the 14mm nano cam), JHEMCU F411AIO HD 40A, geprc tiny 400mw vtx and TrueRC singularity antenna.

The only thing which I will change is the battery, I choosed GNB 550mah 90C 6S lipo (~49A max current), unfortunately the motor-prop combo can draw almost 70A max, so there is a bad voltage sag at full-throttle.
I will exchange the 85g battery for 120C 700mah version (118g), unfortunately that will push the weight bit over 250g.