marc fornes 12 tree house

hi this is matthew and i just got into grasshopper learning for my design course and i have been experimenting with kangaroo as shown below. currently i want to combine those two forms together such like this as shown in the web link but i don`t know where to start can someone who knows how to do this please give me some ideas. thank you all for reading this.

http://theverymany.com/propos-specus/12-tree-house/