Designed for fingerboards. The kicker, funbox and stairs can be used without adding metal parts on them. The hand rail and radius are designed to have a 4mm in diameter metal tube. Glue the metal parts together with the printed model. For printing the hand rail top part, I used -0.2mm hole compensation, which was not enough in Cura slicer. The hole should be 8mm (as designed) in diameter, but printed with -0.2mm compensation was 6.9mm. Use hole compensation in your slicer based on your experience, or expand the hole with 8mm drill. Blender file is included.