Steam Punk Star Ship Deck Plan, the HMSS Victoria, has 3 decks and a poop deck.
Poop deck holds deflated dirigibles when ship enters planetary atmosphere's deploying and auto-inflating with hydrogen gas, most of this deck is outside the hull, and airlocks can only be opened from the bridge, preventing accidental opening when in space. Since the heaviest components of the star ship - the steam engine and the hydrolysis processor, the dirigibles tied to the poop deck is the center of gravity of the ship.
Passenger deck contains deluxe staterooms with double beds, under a glass dome (mostly reserved for the aristocracy). Standard staterooms for high passage guests with separate beds. Central chamber serves as billiards and music parlor. The ship's lounge is fore of the central chamber, and a dining under the dome fore of that. In the aft section, reserved for crew only (except in emergencies to reach sickbay). A pantry sits port, and a refrigerated food storage lies starboard, aft of this is a chef's kitchen.
Operations deck contains bridge, aft of that is the navigational computation chamber, then the crew mess hall, in the octagonal chambers are the Captain's Quarters to port and Sickbay starboard, while the square chambers contain engineer/weapons officers, physician/chemist officers, and midshipman quarters aft. Fueled by hydrogen, this advanced steam engine provides ship's propulsion in space, also through various gears and chains, the various internal controls, door opening/closure, operation of atmospheric lifting wings and steerage sail.
Cargo/Hydrolysis deck, the lowest deck of the ship, contains the advanced hydrolysis processor at the far aft of the deck used to convert condensed ice (I made that up) which is ice condensed 10% the size of standard ice which melts to liquid water 1:100 ratio. The hydrolysis processor converts condensed ice to water for steam pressure, potable water, pure hydrogen for steam engine fuel, and oxygen as a waste product providing ship's life support. Crew berth lies fore of the Hydrolysis chamber, condensed ice storage sits starboard of center, while ship's cargo sits at port. A weapons locker sits for of that, providing ammunition for small arms and the repeating light cannon on turret at fore of deck.
This was entirely created using Xara Designer Pro x11, a vector drawing application with photo texture fills.