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I've been designing a massive Arkham Asylum. It's currently at around 5500 pieces, has 24 standard cells, 5 special cells, an evidence room, lobby, medical room, interrogation room, security office, warden's office and a working elevator. You can open it up horizontally like in pic and also you can take the levels off one by one. I'm saving up to buy it because when I did price gauging on BrickLink it's about $2000. Any suggestions on what to add or something like that? I can post more pictures if you want.