I wanted to be sure I had removed all of the rivets from the tank, so I busted out my cheap Chinese borescope and checked every compartment. I found the last two rivet heads tucked behind the connections for the capacitive fuel sensor.
Mike Rollison was kind enough to lend me his drill press so that I could finally drill the holes for the access plates in the fuel tank baffle. This would allow me access to remove the remaining rivet pieces for the incorrectly installed z-bracket mess-up.
Here is the drill press with the circle cutter installed. 
I marked the centerpoint. 
Using the wing cradle I pivoted the head of the drill press 180 degrees and cut a perfect hole. 
I originally intended to do only two access plates. I would then use my cheap borescope to check all compartments. Upon a little more reflection, I saw now harm in doing four access plates and ensuring I had every single bit of debris out of both tanks. The peace of mind is well worth the effort. Before I install the plates with pro-seal I will use my mirrors and borescope camera to thorough check every single part of the interior of the tank. 
Next I measured out where the plates would be and double check to make sure I had all the spacing correct. 
I drilled each plate in place. 
I’ve been meaning to buy a shop vac for the hangar for a long time. This was the perfect excuse… I needed to be able to clean all the metal bits from the drilling etc from the tanks.
My final task for the day was to deburr all the edges and holes for the access plates. Everything is ready for pro-seal. I just need to order some new pro-seal and clean the surfaces with acetone or MEK. Then the tanks should be ready for leak checking and final install! Only took a year!!
First order of business for today was to move my empennage to the new hangar. Previously I had created a way to hang the tail feathers from one of the beams. However, the beams in the new hangar are wider, and lower. It didn’t require much of a change though. 
I had to install two bits of two by four to ensure the parts remain level and don’t fall with the additional width of the beam. I still need to secure the vertical stab as I always worry that its much more prone to falling than the horizontal stab.
Next up I finished the riveting of the aileron gap fairing and flap brace for the right wing.
I swapped the wings and completed riveting the top skin to the rear spar on the left wing. I used the mushroom rivet set and tungsten bucking bar. 
Next I I countersunk the aileron hinge brackets, and riveted them together. 
I riveted both aileron hinge brackets to the rear spar. AN470 4-7s are just a tad long. A 6.5 would be perfect, and if you make a small riveting mistake its easy to get a bad shop head. 
My final task for the day was to begin fitting the aileron gap fairing and flap brace on the right wing. 