What should I build my monument of Morro Castle Fortress out of?

I have to make a monument by next next week so thats two weeks... WHAT SHOULD I MAKE IT OUT OF?????? my BFF is making it out of toilet paper rolls, tinfoil, papermache, strofoam then using battery lights and gold paper for the inside..WHAT SHOULD I MAKE MINE OUT OF?? its a castle in Havana, Cuba called Morro Castle (Fortress) please please help me!