Here is a KiCad project that contains a DEC Flip Chip template.
I have used this for an Omnibus (PDP-8/e) project. It should also work for Unibus and Qbus.
It is a “quad height” template, meaning that it has 4 edge-connector fingers on it. The “EdgeCuts” layer shows how to reduce it down to a “dual height” or “single height” version, if that’s what you need.