I have done this before but only with a small number of games, like a dozen or two.
You can make it easier by putting everything in Layers in Photoshop, including the X's, buttons, etc. and just hiding the layers you don't need, and saving a Copy.
This will also make it so all your controls are lined up for each shot, so when scrolling through the menu, the controls look to be static on screen, for the most part.
I have also wanted to rebuild GameLauncher, but I couldn't find all the parts he used. Rule #1 if you make software available to others, be sure to make all the libraries available to. Most of his weblinks to libraries are dead, and a web search couldn't turn up an compatible versions of some of them.
Wade