Hi, thanks in advance for the help, I’ve been trying to construct this shape for a few days now so I really appreciate it!

I have included some reference points to make the geometry clearer. There are a few things I’ll clear up:

- The faces with dots, crosses and lines are all flat and orthogonal. Also, the dotted faces have the same geometry.
- The line that traces through point R is circular.
- From P to Q the line goes down (in the y) AND back (in the x).

Thanks heaps, as i said I really do appreciate the help. This has been stumping me for a while!