The prep work for the fuel tanks continue with more deburring and dimpling of the stiffeners. I also had to dimple the flange on the fuel tank ribs around the opening where the fuel senders will be installed. The holes in that flange could have been dimpled with a very short yoke, but I needed to use my DRDT2 squeezer instead. Then I marked and cut the two pieces of J-channel that will be needed later. I started the counter-sinking of the Z-brackets, but my powerdrill ran out of battery and it was getting late so I'll have to continue with that tomorrow.