A few very good points, Aman. The only issues are that if I keep it in the classic's time, then I would have to write the dialogue as such, which could definitely spark some problems, as well as having to make sure that I don't refer to anything modern day (which is more of an instinct for people, writing as how they live). Plus, if I write as the assistant--Watson--then it could also be complicated. Sherlock is the one who makes most of the decisions and errors--Watson just observes and writes. At least, that's how it is in the first few of the Sherlock tales. So if the person plays as Sherlock, they have to figure it out as if they were him, using deduction and such. Being Watson won't give them an opportunity to do so.
So really, I'm just trying to find a way to either make it modern day, but have Sherlock still needed, or in the classic's time, but make sure people can still understand it (not everyone could understand the language of the late 1800's) while also keeping true to the facts.