I temporarily took the SIC panel and measured to ensure the avioncs would fit with it installed. So far so good. Then to make the avionics fit a little better I decided to move the transponder off the hinged panel and replace it with the ADS-B. Then I did a final fit of the panel, cut some more off the corner for electrical wiring access and also slightly adjusted the corner fit. I began installing a few nut plates for the avionics on the 'shelf'.