I see it now. I think I'm going to skip drilling holes in the acetate and use epoxy putty. I could only get 2mm acrylic around here, so I'm taking those and then shimming them with small triangles of 2mm acrylic to push it tight against the slots. Should still work. I also have 4 sheets of acrylic that are just a hair too small, so I may print a wide slot for those to use on the second story of the build.