Matt,
No direct experiences, but why should that stop me, right?
My understanding is that you buy refrigerators that are built specifically for the installation of custom overlay panels. They have instructions that you can download that show you how to install them. I looked at some of them, but they all mention a weight limit and that example you show probably exceeds it. Just google custom panel refrigerators and download their custom panel installation instructions and you will see, if you have not already done so.
If your client is wanting this done on an existing refrigerator then download all the model info you can from the manufacture, so that you see what the door assembly looks like. All of this is just stating the obvious and you probably have already traveled down this road of thinking.
And since I am free and easy with all this non-experienced info, I figured I might as well express how, I really dislike the look of the example you provide. Sorry, it is just too overwhelming for my tastes, but if we were all the same, life would be boring.
Ok, I see you have figured all this out while I was slowly typing.