Created the AHRS shelf from 2x2 prepreg. it's a trapiziod shape that fits in the rear fuselage about 26" behind the aft bulkhead. After trimming it to shape and sanding it smooth, you de-core it and fill the ends with a mix of Flox and Micro. Let cure and sand to final shape. Later we'll drill it and decore the drilled holes and fill them for the bolts.Using a 2x4, I build a 7 BID layup of eglass in the shape of an L. This will be turned in the mount for the AHRS shelf and 1 bolt on each side will hold it.