Interesting username, I guess you like cats.
Ok, I fly the 800XPi and 750 so I can't answer questions 1 & 3.
However, the luggage one I can answer.
The
cabin is fairly similar to the 800. (Click on "interiors")
Main luggage space is opposite the main entrance.
There's more storage further down the cabin opposite the couch. That's usually where the crew store their bags. There's also more storage behind the mirror in the lavatory. That's where we keep Jepps, other docs and stock.
Note, this is the fit for a Hawker 900 as ordered by NJA. The layout is often customised for the person ordering the aeroplane.