rumbutter - it looks like you are well on your way to making a stunning roller coaster. The thing is to keep going and be prepared to use the sledge hammer and redo things until it all fits. I found that trying to force it to work when it wasn't quite right was a waste of time. So out came the sledge hammer and I made a small part of the track go in a different direction and suddenly I had a valid track. I have no idea what was wrong originally.
I am looking forward to seeing the pictures you post of the final thing.
I'm tempted to try to do another one now - but I have other things I need to do as well.
