Thanks for sharing!
I think you did a great job with the landing and were able to walk away in one piece.
The gear damage really seemed to happen during your takeoff, seems your gear slightly touched the ground again right after liftoff. By the way, did you notice you had accidentally selected full flaps for takeoff? That may have contributed to the general instability.
Now to the emergency gear extension handle: this is actually a hydraulic hand pump handle, which means you have to pump your gear down, actuating the handle up and down repeatedly. (and you have to make sure the bypass selector is pulled, but you did that anyway)
But nevertheless, nice job on your landing!