Although the original doublers were used as templates, it still took about 5 hours today to make the two new .040 eyebrow skylight doublers, mostly lots of hand work with the nibblers (pneumatic and manual) and mini-belt sander to cut the center circle. Here's the right side doubler, with countersunk holes and exterior circle all sanded, ready to be clecoed in place for final sanding of the interior circle to match the roof skin hole. I'd hoped to get this done today, but 'tis not to be. Patience is essential in this biz.