I think the Sherlock Holmes study is impossible without a pipe and a magnifying glass. :) So I'd add those to the list, and I might actually attempt creating them. As a starting excersise.

Other items that could be useful in this project (mostly from the nik nacks category):

• Case index file (That box with indexed cards and all sorts of papers)
• medical instruments
• tubes and all sorts of glass thingies for his chemical experiments
• the theatrical makup kit (the old fashioned kind he would have used)
• scales and weights

Also, what about walls, windows, door?

And yes, of course for this type of challenge using ready made models is cheating, but i was simply suggesting that modeling harder to find objects would be of more use to the rest of the community.