OK, after searching around online and finding an additional level of blueprints, I've decided to amend my interpretation of the blueprints slightly...
Here is the 1st level:
You can see the C-ticket boat ride in the upper right, which coincides with the area where the queue is.
In the center of the building is a room marked "Glasses Cleaning", confirming that this will be some kind of 3D attraction that'll use an in-house cleaner rather than a central washer facility which I think most of the other 3D shows use.
I also don't think that any of this level will have Guest access. Almost all the corridors are labeled BOH, which in theater terms means "back of house" or backstage areas. There are markings in each of the theaters that kind of look like rooms and partitions, but I think those are just foundation pieces for the ride system. I just don't see any way to get Guests down to this level of the building.
It's also worth noting that the top two theaters (Theaters C and D) are labeled as "ADA" meaning they'd be the two that wheelchair and other mobility-impaired Guests would use.
Now we move on to Level 2:
Now we start to see some of the ride mechanics in place in each theater. Of major note is the green corridor labeled "Show Exit" running straight through the building but most everything else on this level is still labeled BOH. You have two green staircases at the very bottom of the plan that dump into this Exit corridor. But there seems to be no way to get Guests from the ride chambers to these stairways or exit corridor, so once again I do not believe there will be any Guest access to this level other than the Guests leaving theaters A and B via stairs from at least the level above and exiting out through the two sets of doors at the top end of the Exit hallway.
This also shows us that Theaters A and B will exit out of the ride building on a different level than Theaters C and D. Presumably there will then be some way that the two will merge (gift shop?) that is beyond the scope of these blueprints.
Lastly, the two white staircases at the top and bottom ends of the Exit corridor appear to be strictly fire and backstage use.
In the upper right you see empty space for the C-Ticket boat ride with just stairs going through the space, so the indoor section of the boat ride will be two stories tall.
And now for Level 3:
Now you start to see the queue in the upper right, placed on top of the 2-story C-ticket boat ride.
What caused me to reconsider my original idea of a single-level loading are the two stairways on either side of the C/D exit vestibule at the top center. Originally I thought those were leading up from the cross-over hallway from Theaters A and B. But those two stairways don't appear on the Level 2 plan. So those two stairways *must* be coming down from at least Level 4, which is a level we have no blueprints for.
So, at some point in the straight-away between the queue Merge room and the central distribution level you have Guests being routed to at least Level 4, perhaps Level 5.
Looking at all the mechanical stuff on Level 2, perhaps there are only two levels with ride vehicles, and Level 4 is more mechanical stuff for a ride vehicle loading area on Level 5.
But alas, I've run out lunch break time so if I've left anything off it'll have to wait until this evening...
-Rob