Here's some Kool Stuff to for motor cover, it's what they use in trunks of cars, it's pretty thin stuff, will stretch into dips and corners and keep that form, then it's easy to stick it in place, I use the 3M 99 spray adhesive.
My buddy Mike came over today and brought a broke up instrument panel off his CV-16, that he will be bringing to Red Wing in August, we got it stuck back together and will be popping a dup off it for his boat.
got the first layer of glass on Barbs panel, will finish it out for the duplicate today, the Faria gauges, speedo and tach, are a bout 1/4 " larger diameter than the original. I will modify the dup to fit the new gauges, make a mold for Frankie to vacumn form the new panel, out of the same material as the original.