First off, thanks to DPRoberts for sharing the Bulkheads with the Course Forge Family! You will see them all over my course to build steps, planters, walls, etc.
You can use the word Spline on your 3D objects hierachy to get proper avatar and ball placement. I struggled with it a bit on some of the objects and here was the fix.
While getting my course beta tested some things came up and it was suggested by CrazyCorey to put it up here also for others to see.
You can't name it spline like this:
Otherwise you get this:
You need to name it spline like this:
So you can get it to look like this:
Also don't forget to add in the collider physics too: