New answers tagged overlay
The appropriate method ended up being to use Inkscape. In that regard, I'm sure that Adobe Illustrator would have also worked, but I didn't have access to it. Snapping to the guides and paths ended up being exactly what I was looking to accomplish.
There is not a possibility to change the layer of multiple layers at once. There are, however, two possible workarounds: Place the layers you want to affect into a folder, and change the folder's Layer Style. Change the Layer Style of one layer the way you want it, then Alt+click and drag the 'fx' icon from one layer entry in the Layers pallette to every ...
Draw a shape, reduce the fill to like 10%, duplicate and rotate. Here I did it with 12% fill. No blend modes needed:
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