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This cradle is designed to hold 12mm x 15.5mm x 19mm motors for use in HOn3 locomotives. The cradle is 12.25mm wide at the top, 8mm wide at the bottom, and 25mm long. It has holes the correct size to tap for 2-56 screws. Included are staybolt details to simulate a firebox. I designed this for my 4-6-0 project, but could also come in handy for remotoring MDC 2-8-0s or possibly other HOn3 locomotives.
You can print this in steel or plastic - steel would add more weight but is more expensive.