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A simple variant
A simple variant that you could make with a drill press.
Drill the middle hole in block 4, then clamp 2+3+4 together. Drill the small holes in lock 3. Use block 4 as a template and drill through 2+3 .Also drill the other big hole through 2+3+4. Unclamp and reattach block 1+2+3, then drill the holes in the copper block using 2+3 to lineup the holes. Unclamp and cut a larger hole in block 2 connecting both holes. Screw / Glue all blocks together.
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