Laid out rivet patterns 1 inch. 10 holes along each long side. 6 holes on each short side between each side. 32 holes for each backing plate. Trial fit everything in place. I like it. Very nice access to everything forward, such as VPX, Ground forest of tabs, radios, navs, wiring, transponder, manifold pressure, engine monitor box, etc. Very cool.
Backing plate on left side butts up to center rib flange. No extra room. 1/2 inch underlay is max.
