When you resort to 3D printing to make your cat happy.
I think it worked!

STLs:
Lower sphere for variable angle joint : https://v4.no/stls/lowersphere.stl
Bar for sphere: https://v4.no/stls/bar_sphere.stl

231mm long plain bar with 5mm spacer: https://v4.no/stls/bar_spacer231mm.stl
167mm long plain bar with 10mm spacer: https://v4.no/stls/bar_spacer167mm.stl

No STLs published for the arches at they are not ready for general use