If you are going to put an FC in that Mini Mustang I think you will want a small form factor board. For an F4 an Omnibus F4 Nano (I have a couple) and for an F7 a Matek F7 Mini which currently requires the Dev version of Plane. For eample here is the Autopilot system that I had in a Plane which was obliterated in a crash. Kaute F7 AIO, small M8N GPS/compass module and a Frsky R9MM. I also had a ESP8266 radio in the plane for basic configuration, calibration.
