Dropouts with tapped hole for mech

Small parts manufacture continues, today the dropouts.  Information about dimensions were a little hard to find - Shimano publish standards that they recommend if you want their gears to index, but it wasn't clear if they were universal (I like SRAM kit).  So I made them to the Shimano standards and here's hoping for the best.

I bought the cheapest bench drill I could find. It is remarkably accurate - as long as the quill is not extended too far a 10mm hole is +/- 0.01mm, almost lathe / mill accuracy.