I carefully countersunk and gave a slight dimple to the hole by the landing gear cut out. I'm afraid a full dimple will split open the hole. But a rive head fits flush in here now so I'll rivet it when the time comes.
I primed the whole bottom because this is interior compartment where feet go. And I taped off and primed the slice that fits under the side skin. The photos look like blue primer but it is the grey stuff I've used from the beginning.
