For my order with Mielec I made a document, containing a CAD sketch with all dimensions, a list with all dimensions and a list with all requirements, starting with tubing and covering everything from dropouts to color.
If you like I could send it to you as a template.
Initial ideas of how to communicate my requirements clearly. I just pulled this together quickly so it's a bit messy.
Frame colour isn't right but I am thinking black, still, and with a black frame it's harder to see the details on bikeCAD.
I'm on the fence about the integrated 44mm headtube idea. Might be overkill.
PDF is a better resolution than the JPG.