In reply to ryans2:
all dedicated to a wall? windows? where's the door? It sounds massive! What is it made of?
What do you climb (style, grade, holidays destination, goals)?
I'd say just to get things started (for suggestions). 1 plysheet width at 40/45° and 1 at 30°. with 50cm kick board. Add ceiling holds (should be 1m ish at the 45° and 1m30 at the other. Could put really nasty slopers and tiny crimps with shit footholds at the vertical behind (so you can do round circuit?). Put a finger board above the door frame. Fairly simple to build, only 4 sheets of ply and not a huge amount of wood at the back depending on how the store room is built,