Hi, @MHefny and thanks a lot for your FOSS design of this ardupilot platform! Its simple and cheap and could help against the annoying chip shortage and rising prices of the STM32Fxx chips.
I am wondering if you or any other one who use your design can give me any feedback on stability of the platform ?!
Did you every saw any unwanted reboots of the pi due to software (kernel or ardupilot) or hardware (e.g. pi wants very stable and clean power supply - otherwise reboot) or any other problems?
Also did you ever experience any filesystem corruption of your pi due to hard power cutoff?
Others (e.g. https://www.reddit.com/r/diydrones/comments/mrhylk/comment/ifl9oob/?utm_source=share&utm_medium=web2x&context=3) also describe that actually a lot of commercial products use SBCs as fligthcontroller, and i am wondering why this is not the case for hobbyists? Thus its intersting if you could share your experience on stability 
Thanks!