A couple more pics. I've installed the rigging tubes and getting ready to install the fuel tank. In the second picture you can see the stainless unistrut I fastened to the stringers. There are four of these and will be used to fasten the tank in place.
Rigging tube passing through the fuel filter compartment.
I used a hole saw to drill out the rear drain. You can see where the new one was centered vs. the one from the factory. I guess that mass production doesn't lend itself to the same tolerances of someone in the backyard.