Jet Pack? No sir...STEAM Pack!

My next project is a piece that is part of a theme environment.  In this case, it's a home theater.  I have already designed much of the room and have several pieces to complete, but thought this one would be a great place to start. 
The concept for the Theater is a Jules Verne inspired airship named "The Aeronaut".  I'll post more about the theater soon, but we'll start with the emergency "escape packs" which allow guests a quick escape method should the airship meet with some form of destruction.
These "escape packs" allow guests aboard to fly from the airship to the ground- and even incorporate a pair of back-up parachutes should the steam run out at a bad time.
I have no doubt some elements of the design will change as I progress. The drawing is a guide, but I try to keep it a somewhat loose one.  The process of building objects like this always seems to present ideas along the way that improve upon this initial sketch.