After removing the bottom skin and gear weldments, I cleaned all the AL chips out and did some deburring of the relevent parts. I reassembled everthing minus the gear weldments and counter sunk all six holes.
The AN509-10R12 screws are from Bag 1968-1 in the Fuselage kit.
I am running out of pickups prior to taking everything apart to dimple/coutersink and prime!