A bank

This is the frame for a long radius 90 dgree turn with built in approaches,

3" tall with another 2" guard rail

I start by tracing the track pieces and cutting them flat, saving the inner Radius pie shape for later.I then make 5 or 6 right triangles about 3" x 12" which I tape to the underside of my bank.

When I set it upright the inside is "popped"up so I take a weight, place it inthe centerpace my pie piece back down where it started, and tape it to the banking.

Last, add the bottom wrapper piece so it goes under track for support, then tape the rail on top of the track. that's about it,do some adjusting and have fun!