Here's the completed Rhino chassis with all of the magnetized weapon options. From doors to turret, it's all their on this model.
Here are the links to show you how I got here: Part 1 and Part 2
Doing this to your model will allow you to make one Rhino or Predator in any configuration which is a great feature when it comes to changing things up as your list changes.
Hands down, this is the way to go with vehicles.
A quick review of the process:
Part one, the body
Part two, the turret