Have been playing with the spirograph extension a bit and now I can produce hipotrochoid that match the topview of the "roof' structure, but I cannot add a right sample parameter, to align the nodes with the repeating shape of the path.
Tried to reproduce it with the parametric curves but then again, the ending parameter of t doesn't have a matching input with the function.
Guess it is one of those times that shouts for a new extension.
Oh those future plans. And postponing.
Anyway.
The previous elevation views with the steel structure, cylindrically projected in
this post, is now turned to 3D rendering with blender:
Click on it to enlarge.