Matt had several items that he wanted in the production machine. Some made it and some did not, he has sculptures, casts for molds, and molds of all these parts along with many variations of different items that had to be tweaked before being approved for the game. Like he said, he has been working on this project for over two years. Once he was able to get caught up on making all the items that did make the game, he was able to start producing the ones that did not and offer them up for sale.
I visited with Matt a month or two ago and you'd be amazed at the amount of work / man hours that goes into producing all of these parts, it has kept him very busy. I have known Matt for awhile and can tell you that he would never plagiarize somebody elses product, he has too much pride and would never succumb to something as low as that.
Disclaimer: Not to take anything away from JJP, I have my machine and am very happy with what is in it.