Just a note of caution. Be careful when changing the flooring in a GH. The Alchemy Room we discovered comes with its own flooring and can't be changed. If you do the Alchemy Room is removed and the new flooring put in its place. We had to get a Guild Master to reinstate our Alchemy Room as we didn't realise that the changing the flooring would remove it. The mistake cost us 14k for the change of flooring but we were just very pleased to have the Alchemy Room back.