Built this from my original 5" Source One by adding 7" arms and Emax Eco II 2807 motors. The build is designed around running a 4S 4200mah li-ion pack to achieve 5-mile round-trip distances at moderate cruising speed.

Frame is using shorter standoffs than stock, and deadcat arms in the rear with normal arms up front. This was originally because I only ordered 2 deadcat arms, but it turns out that the props aren't in view after processing in RealSteady GO, and the normal front arms leave more clean air for the rear props in this configuration.

Running a 4S 4200mah li-ion pack (Molicel 21700 P42A), I get 10-15 minutes of flight time. That allows me to cover 5+ miles on a single pack. The horizontal Crossfire antenna placement isn't ideal, and I do get a significant drop in LQ and dBm at my turnaround point, but have yet to actually failsafe (knock on wood).

Current CLI diff: https://www.dropbox.com/s/ala0n65u6od423p/SOURCEONE%20Betaflight%20CLI%20%2820210819%29.txt?dl=0