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!
James Ritossa shared a pack of Wood Roof Tiles on Gumroad for free. The material will help you generate an infinite amount of tiles in Substance Painter, Substance Designer, and Unreal Engine 4. The pack can be used with any tool compatible with .sbsar file format from Substance Designer 6.
For optimal experience please use this material at 2048×2048 resolution! You will have to change this in whichever program you use, as it is set at 512×512. This is very easy to change within UE4 or Substance Painter / Designer, or Marmoset.
This pack contains the sbsar file, not featuring the mesh shown on Gumroad. You are not allowed to resell, trade or exchange it. You should also contact the artist about studio pricing.