Two hours ago I got 10 cubic yards of topsoil to level off the terraces in preparation for the plants and mulch.
The area will not be as steep as I originally estimated. Plus, there will be plenty of room for long runs and wide curves.
Problem #1 will be to build a solid bed with 4-6 inches of mulch underneath. Maybe I can use bricks and blocks to support the track. Yep, that should work. Thanks.