Yes it is possible to do without Rhino or Grasshopper. This new ARCHICAD speed modeling tutoral shows you how. Just normal knowledge of geometry and a design idea 
https://youtu.be/LtwW2eMNlO4
Carsten
www.asmtechbase.com
https://www.youtube.com/asmtechbase
AC 3 to 26 -Windows 7 - 24GB - 8core 4.4Ghz
