The lower decks of the saucer are quite small in diameter, and in laying them out I looked to the refit plans as a guide. I've made minor changes to the window placement - some of which is quite arbitrary on the Enterprise model. In TOS-R we see other Constitution class ships with variant window arrangements, so technically this could be canon.
About this creation
Deck H (saucer): This is the saucer cargo deck, meant to handle consumables and small items. Larger cargo, such as the standard cargo pods, is handled in the secondary hull where there are much larger hatches. The three hatches here are quite small, and are a slight variant from the Enterprise (and disregarding the “Inspection Door Vent Systems Connection” label on the 11-foot model). Two cargo transporters dominate the forward area, with a transfer corridor and cargo holds around the back. There is a variety of cargo handling equipment, such as antigrav sleds and detachable handles. In the aft centre hold is a ladder up to G deck. In the middle is the ship's fabrication facility. This is where non-standard equipment is replicated from custom designs and templates, such as culture-specific clothing, spare parts, and so forth. I tried fitting the legendary 22-person emergency transporter here as well but I just couldn't find room, and it's non-canon anyway. Maybe in the secondary hull? We'll see, but I think the transporters on G deck are enough.
Deck H (neck): The explosive bolts for saucer separation are placed here. Given the lack of escape pods It seems necessary to have this feature in the event of a core breach. We first see the separation feature on the refit Enterprise and I have chosen to include it here as well. Matt Jeffries always intended for the saucer to act as a separate lifeboat, and this was included in the writer’s guide for TOS. A separation scene was storyboarded (but not filmed) for the refit Enterprise in The Motion Picture, when the Klingons return at the end of the film and attack the ship. The 6-foot model from 1979 was even built to come apart. Unlike the Enterprise-D it’s a permanent separation requiring extensive dock time to reconnect, assuming both hulls are recovered intact.
Deck I (saucer): Forward is the lower phaser control room. In hindsight I think I placed this too high – I should have squeezed the phaser cannons in somehow underneath the torpedo launchers. But I didn’t know how it would look until the outer hull was completed, which was the last part I worked on in this section. Also I didn’t want to have the cannons on a separate deck from the control room, which certainly wouldn’t fit down there. Port and starboard are personnel airlocks and aft is the ship’s laundry (all sonic-based so there is no need for water storage). In between are some observation lounges. The Enterprise model appears to only have a starboard airlock but I wanted to be symmetrical. On the other hand, the port side of the 11-foot model had visible wiring and mount points, and was not as detailed as it was never meant to be filmed. Shots where we appear to see the port side were achieved by reversing the decals and then reversing the film (which ironically makes the symmetrical airlocks canon!).
Deck I (neck): Continuing down the interconnecting hull, we find the turboshaft, a forward gangway, and an inclined Jeffries tube aft. The forward rooms are long-term storage areas (though I’m not sure why there would be so many windows here). Since the turbolift doesn’t stop in this area it limits what can be stored here – probably items that can’t be replicated and might be essential, but not commonly used. My turboshafts are a bit big and there might actually be room for more stops if it were rendered in Sketchup or 3D Studio Max. Decks J-N in the neck are essentially the same, with some power subsystems behind the turboshaft.
Deck J (saucer): This area is entirely dedicated to the photon torpedo bay. In Star Trek VI Scotty pulls up the torpedo inventory which shows a full complement of 96 torpedos. This is of course on the refit Constitution class but I followed it as a rough guide for designing this level (I’ve got 108), taking into account that my torpedoes are somewhat smaller (they won’t fit a minifig for space burial). I tried to design a launch system that could be either automated or manual, with room to physically modify a torpedo if necessary, but it’s another area we never see on screen. In fact, throughout the run of the Original Series it was never clear exactly where the weapons came out of. Both torpedoes and phasers looked like they came from the lower sensor dome, and in the remastered episodes this has been “solved” with a lot of light splash around that area. Fan-made series like Phase II and Star Trek Continues have introduced visible ports which were not present on the 11-footer, while some artists interpret the ship with multiple banks of refit-style phasers.
Deck K (saucer): This is really just a single room dedicated to sensor monitoring. The lower sensor dome, or planetary array, is identical to the stellar array above the bridge, consisting of short-range sensors. Passive sensors use parabolic dishes to detect emitted radiation, while active sensors send out a signal of their own which is reflected back and measured. These are the ones that can give a ship away to an adversary, as in “We're being scanned!” Surrounding this is a network of plasma conduits and 2.8 cubic meter tanks for phaser coolant.
The starboard airlock.
Staring down the barrel of the big guns.
The lower sensor platform.
I hope you’re enjoying this tour as much as I am designing it. Don’t forget to like and comment! I will be doing the warp nacelle next, since the secondary hull has a rather more complicated set of curves to deal with …