A little more trimming between the cowling halves to get the exact "credit card" thickness the painter would like - almost there. I also started the flange preparation by laying out the attach line, countersinking each hole for riveting on the lock devices and determining that a 3.1" separation for each Skybolt fastener may work. The final separation distance of the flanges will be determined after the upper cowling's lower flange distance is finalized.