Okay, okay, you’ve prompted me to try out the solution I’ve been wondering about: Watermarks. I’ve never used watermarks, but here’s what I found.
I saved out a PNG (not JPEG because JPEG doesn’t have transparency(?)) of that foreground “matte” (mask) layer shown above and brought it into SU as a watermark. That way it can provide the foreground matte while the match photo picture provides the background photo and the SU model is sandwiched in between. It seems to work for presenting right in SU. For photo realistic renderers like V-Ray or Podium, you would still want to merge them in Photoshop.
Adding a watermark via the Styles Pallette
Making it foreground as apposed to background.
Make it fit the screen just as the Photomatch Photo does.
The catch is each Photomatch scene will require it’s own style with it’s own matching watermark.
Result in SketchUp after all that.