I retrieved the T-711 angle bundle from the parts shelf. Four angles to cover both tanks. Four different part numbers are required: T-711A, B, C, and D. They have pilot holes and CNC marks to guide creating each part much like the elevator and rudder stiffeners from the empennage kit. I cut out one tank’s worth of stiffeners with the tin snips and then worked over the edges with the bench sander and then the scotchbrite wheel. I called it a night before figuring out which parts were which.