Drilled and riveted transponder antenna doubler (.063) to forward, bottom skin. Inventoried Instrument panel and avionics that arrived from SteinAir-- unreal how great the packaging and quality of work that SteinAir provides. HIGHLY RECOMMEND!!! They even laser etch your panel on both sides of the beautiful shipping crate-- how cool is that? I went with the carbon fiber instrument panel that Geoff Combs makes at Aerosport Products. Top quality and looks amazing! Hey, you only live once.