Thanks to Tracy Snell's update to the tutorial, I succeeded go through it from the beginning to the end and have now the running result of the whole thing.
The thing I have the biggest problem with in MPS is the way models are actually edited. Having to change to another cell to type in the next portion of the program is just - sorry for being so honest here - horrible. It took me about half an hour to type in "Sytem.out.println("Hello")", because I first typed parts of it into one cell when they needed to be typed into two cells. I could only type in the string literal by using autocompletion, just typing in "Hello" didn't work. I had to CTRL-Space, choose '" string literal' and then type in Hello. What I need here is something like IDEA: at the base a plain text editor with added intelligence that assists me. MPS is more like a form based GUI application that looks like a text editor but clearly isn't one.
Are there any plans to make it feel more like IDEA in how models are edited?