My custom build of the popular micro long range design.
Some minor issues I encountered:

1. on this FC, UART 1 is shared with the DJI O3 and interfered with my RX. I moved the RX to UART 5 instead of pulling pins from the O3.
2. I wired the GPS signal wires backwards. Oops.
3. Could only use a very small piece of UMMAGRIP without putting it over 250g.
4. Had to remove the TPU arm guards to keep the weight in check. Currently 248g AUW.
5. The only place I could fit the RX is sandwiched behind the O3 camera. I cannot adjust the camera angle now.

Update 1: de-casing the O3 camera and removing the TPU arm guards removes 4g. The camera has room to be adjusted again.
Update 2: this quad flies great as long as there's little to no wind. I fly in a pretty windy area so this can be a struggle. I'm consistently getting over 8 minutes of flight out of the 750mah LiHV. I flew about 3km away and LQ never dropped below 100 where I see it drop as low as 80 doing the same flight with other quads. This was my first time using a diversity RX and I'm quite impressed.