Glad to hear it was resolved. As others have said, this is an unfortunate reality when dealing with businesses that support such a niche market. As Spencer said, they're typically not very savvy business people, and it puts more ownership on the consumer to ensure the process goes the way they expect it to (you did the right thing by using Paypal to protect yourself). No excuses here, just a reality of the world we live in when we choose to own/modify a platform that is not mainstream (Jeep, Toyota, etc).
For what it's worth, I've personally never had any big issues dealing with PRG... I thoroughly read everyone's concerns and previous issues before placing my first order, and went into the situation with proper expectations and prepared to be a bit of a pest to get things accomplished. I did have to bug him once or twice on some things in the past, but again, with proper expectations, I was never disappointed with my experience. He's a good dude with great intentions who is often times in way over his head. I do understand that others have had horrible experiences, and it's a bummer that it happened that way for them. But at the end of the day, he's got a vast knowledge of our platforms and has developed some great products for us, and most of us are very thankful for the support he offers the Nissan community.