Yea, this is my first attempt with Newton 2. Hadn't originally planned to release it, but was happy enough with the trackwork to support it and release it.
Well, I can't tell all of secrets...but I will say that the loop is a multi-zone with 3 normal zones and 1 banking and no laterals. The 2nd inversion really isn't an immelman.
Again, a multi-zone force. A constant g-force for most of the rolling section (Don't have the newton file open, but I think it was about 2g), then increating from that to about 4, starting near the peak of the roll and then continuing on to about the vertical point of the loop, then constant G into the rest of the layout.