Since you guys are doing things with 3D models, I would love to throw out my 2c. My team (flair.co) sorta splits electrical and mechanical design along people lines (even though we are comfortable with both sides). I don't end up doing much board layout but in terms of vetting a relay or some Caps for fit, being able to drop them into my mechanical design would be great. My flow right now is, go to the internet (if in the states) or sometimes the market (if in shenzhen), measure the parts with calipers or look at the data sheet, build a model in Fusion360 and then import that part into my design. If you made a plugin for Fusion360 and perhaps a few of the other popular mech e packages(solidworks, onshape, etc.) that would be fantastic!