Here is our AvBay sled for a Perfectflite StratoLogger CF to fit in a standard 3" AvBay with 1/4" threaded rods. It aligns perfect to Madcow 3" aluminum bulkheads and is designed for use with a 300mah 45C 7.4v Lipo battery.
https://www.thingiverse.com/thing:5348889
https://www.thingiverse.com/thing:5348889