help im in over my head
 

:headbang:
i have just been asked to model a concept design for an amphitheatre, and it has a roof shaped like a boomerang for the aboriginal society, problem is i have only been using maya for a short amount of time at sae and i have had to deffer and move to outback australia so i am not at collage any more, i am a graphic artist and painter buy trade i managed to make the boomerang roof no problems its just the rest i am having problems with how do i make an amphitheater ive been atemping this with the created poly tool than extruding face for the outer perimter but how do i make the sloping stairs, seats etc and it has to stay in the aboriginal way eg i have a drawing they sent me but oh my god where do i start.

Help please i need to have something to show them buy wed this week i have attached the drawing see what you think
anita i will owe you my soul if you can help me.