I applied the decals to the Widow recently. They're from AeroMaster, for the aircraft "Moonhappy." This was the first P-61 to be credited with a victory, and was based on Saipan in 1944. The wingwalk stripes were easier than they look.
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You can see pics of the PE frets and interior construction here: http://www.pix.prettyneatinc.com/widowbuild.htm
Thanks for letting me share the build with you !