Oh no, I just found a big problem.  As I was looking at my tank and the turret rotation gear I noticed that the arm and servo that controls the steering is in the way of the rotation gear that needs to extend below the bottom of the plastic body.

Looking again at the pictures in this post I noticed you have a two motor set-up and have no servo / arm right below the hole, so there is no conflict there for you.

Has anybody used a henglong rotation gear in a stock Leo A4 / Gepard?  If so does anybody have any mounting methods that will not see the rotation gear and the steering assembly bang into each other?

Thanks!