Hi Elliott, This is a great breakdown and very generous in sharing your process and insights, you came a long way from the vending machine days!
Are you planning on releasing the UE4 project to the public? Or only builds? I'd love to play around with it in the editor if possible!
Dan Rozanski came up with another set of alpha masks, which could be used commercially in your products.
This pack includes previous released 14 floors from 245 hardsurace alpha masks. All alpha masks are in 2048 resolution in PSD and TIFF formats. Include bolts, decorations, floors, pipes, valves, vents and wall shapes. Masks can be combined “link below”, and can be customized.
Alpha masks was tested by software like Zbrush, Quixel, Substance, Blender and Mudbox. Here’s a little tutorial, which can help you to work with these masks.
All alpha masks in this pack can be used commercially. Repacking or reselling is not allowed. The pack costs just $3.