Yikes!!! I feel your pain. I lost my Phantom 4Pro over water. Fell like a shot duck with a catastrophic battery failure.
I learned the hard way about constant battery health monitoring.
Great idea jpalamaro! The Oly 14-42 definitely needs front weight. Without any the lens even when extended seems to make the gimbal back heavy and puts unnecessary strain, I would think, on the motors.
I haven't found one. I use the DJI case for local use finding it works for most jobs and ONLY use the big hulking case (found on eBay for half original cost) when shipping to an out of town location.