WOW! I feel like I really kicked the hornet's nest here!!
I've been at it for over two years now in the Trainz community, and I still have my little snafus here and there. I bought your CR SD70MAC within the past two months or so and wasn't able to get it to work, downloaded the dependencies again, still couldn't get it to work, and if I recall correctly, the issue was not having the interior, which I was able to find, install, and get working. I consider myself a pretty experienced user, and it took a little chasing down of things to get everything working. I can imagine a new user's frustration, especially with a piece of payware, when they can't get it to work right.
After seeing countless threads in the forums "Jointed Rail Sucks!" "I HATE you guys!" "I'm going to sue you out of existence" and whatnot from these very sorts of people, who typically install, doesn't work, and get the flamethrower out from the closet, it is certainly understandable to make it an automatic process.
Although I've been too broke to make the jump onto the Club Car (my day will still come!), and I haven't actually been able to download and try this, I like that you guys have put it out to test like this. I'm glad I could have planted the bug in your ears to not forget about the Mac people, and I'm interested in seeing where this goes.