haha I'm no master by all means. Ok I use it 13 years by now So I know my way but I don't see myself as a master.. :-)
R13 is a lot of fun indeed. I love the new character tools. It is easy to build a rig now.
But as said, for hard surface modeling I use Moi3D now. Mainly to learn the application so I can help our forum mebers with questions on C4D->Moi3D->C4D

Peace,
Rich_Art. ;)