Completed drilling the fuel tank attach brackets to the spar. Attached the platenuts to the brackets, and the platenuts to the rear of the spar. Fitted the fuel tank to the spar; match drilled all holes in the fuel tank. Attached and match drilled the tank stiffeners. Match-drilled the fuel tank to the joining plate. Countersunk all the tank skin to rear baffle holes.Lots of aluminum flying around today!