Merge control panel image and controls images, batch process?

[Necro]

Anyone know how I could merge a autoscaled version of a control panel image into another, larger image showing mapped controls (from CPWizard) as a batch process? 

I know how to do it manually. 

(And the issue with having CPWizard do it is that it stretches the control panel image.  I'd like for it to scale up into an area and be as large as possible so you have an image of the original above the mapped controls. This is my alternative approach since I can't get CPWizard to do what I want directly w/pause or bezels.)

[nexusmtz]

Imagemagick is pretty good at resizing by aspect ratio and making composite images via commands.