Measured the height of the center of the cabin frame at 18-1/16”, which is 3/16” higher than specified on Dwg 40. Started trimming the ends of the cabin frame to fit inside the F-631C brackets by making notch in the outboard edge of the cabin frame the width of the bracket, 3/16” deep at the aft edge and parallel to the longeron. This got the height of the frame down to 18” even.
