What if Zaku was made for airdropping? I'll think about what modifications a suit would have to make for the environment it's made in. So for it to be able to fall from the sky safely, it would have to lose a lot of weight.
I started off by trimming down the armor of the suit. The knees, shoulders, and elbows all had to go. I replaced the power cables that a Zaku normally has with a thinner wire to make it look lighter.
Another modification was to change the weapons the Zaku carries. The heavy drum of the Zaku machine gun was too much, so I kitbashed a new machine gun out of an Origin anti-ship rifle and the front end of a Zaku machine gun. This thing would probably be carried in an airship for most of its time outside of combat, so I attached carry handles all over the suit so that storage would be easier.
And the final change was to the thrust. I used the Agguy's backpack as the Zaku's "parachute". Added some disposable weapons like the bazooka and missiles to clear a landing zone while in the air.
And finally, when it lands, it'll take off the backpack like the Gundam ground type's parachute pack. But it still needs a backpack for when it's on the ground. So I moved the normal backpack to where the back skirt would normally be.