Today I drilled the remaining rivet/bolt holes on the avionics rack, and fabricated a pair of support strips that will be riveted to the bottom center of the fuselage attach rails. These strips will help carry the weight of the various black boxes, instead of the two support rails acting as a long cantilever bridge, and carrying the entire load only at their ends. The strips will simply rest on the floor.
I drilled out the six holes for the AN3 bolts that will attach the upper layer to the lower rails, and began drilling these holes for six #10 nutplates.
Closeup of the support strips under the mounting rails.
An overall view of the avionics rack, with the support strips at bottom.
The upper rack layer is shown detached from the lower rails.
