OrangeRx R615X case for 30.5x30.5 (Naze32, etc)
Case for stacking the R615X with the PDB and Naze32 (or CC3D/Flip/MassiveAcro, etc 30.5mm square boards)
Remove from stock case and slide into printed one. Secure lid with a zip-tie. The mount holes are pretty small and friction would definitely hold the case on. I still used the nylon nuts though - extra safety factor.
Definitely thinner than the stock case and now can mount in the central stack.