Secure power plug to above brackey with 4-40 x 1/2" nuts, bolts and lock washers.
Cover panel blank with wide masking tape. Layout location of all components and suppoert bracket for GPS mount. Drill 1/8" pilot holes for circular saw locations and 7/16" pilot holes where nibbler will be used. Fabricate GPS Airgizmos mounting bracket from 3/4" Al angle stock 8-3/4" long.