That gimbal assembly is so trashed that there really is no point in trying to fix it. You have like $100 in motors that are potentially compromised (I see two that look like they have flex cable damage, meaning they're as good as dead), that yaw arm and cable are another $30, I don't even know if you can get the housing assembly, then there are all the boards in there that may be trashed. You might as well just buy a gimbal assembly, someone has it for $400 on here or $450 OBO on ebay, and slap it on there. By the time you try to fix that thing, you might end up with a dead-end due to lack of parts, or end up spending more than the amount of a new one.
Those landing gears are trashed, which is like $30, and the mounts might also be dead. Make sure they're okay, otherwise you'll need a new shell, which is around $65.