I need to find a small facility plan I can use for a very quick adventure setting. The idea is as follows:

On the moon called Murgos, shot out of its original orbit and pulled into that of a Warp rift, a Tech Priest agent of the Inquisitor, Binarius Thule, needs to be rescuing after transmitting a coded message via Astropath to the Inquisitor’s headquarters.
The content of that message explains that the experiment has reached a critical stage and must be transferred offworld. The moon is starting to tear itself apart due to instabilities in the nearby rift.
The acolytes are dispatched as the only nearest agents of the Inquisitor to rescue the Tech Priest. They are not briefed as to the nature of his work, nor are they even made aware of its existence. They have no information regarding Thule’s work at all.
Unbeknownst to the Inquisitor, and thus the acolytes, Thule is corrupted. He is now Heretek; his work with the experiment and the close proximity to the Warp has opened his eyes to a different reality. He has new masters now and they are eager to receive the experiment.
To that end he wants escape from both Murgos facility and the reach of the Inquisitor. All he needs is safe passage. This is easily achieved so long as the acolytes do not discover, prior to reaching him, he has turned. Unfortunately for him they will learn this fact early on in reaching the facility with the presence of a psyker and the availability of clues.
The rescue process is also hampered by the presence of malfunctioning servitors, hereteks loyal to Thule and some minor warp entities, including mutants that are the result of his work now freed from their prisons by the failing facility. There is also a time limit: the facility is collapsing and the acolytes are pressed for time.
Thule will assume the acolytes are none the wiser unless they declare their position. Upon reaching him they will be presented with a choice: Thule can transport them all off the moon by means of a Teleportarium device, or they can attempt to kill him (of course he will resist).
The choice comes down to this:
If they kill Thule their escape will take much longer; they have no hope of operating his technology to reach his vessel.
If Thule learns they know of his treachery he will attempt to escape. This results in combat the same as if the acolytes attempt to kill him; however he has a brief window to escape.
Should he escape or should the acolytes kill him, they have to make their way back through the facility to their rendezvous shuttle in time. This is an extremely tight window of opportunity.
Thule cannot teleport them to their shuttle; his device will only transport them one way – through the rift to a waiting shuttle of his own. The acolytes can only imagine what will happen to them as Thule will have the upper hand. They do not understand his teleportarium device and will only know that it is pre-programmed to a set destination and cannot be changed.
Furthermore, the facility was designed to be shielded from the Warp. As it is failing, there is a chance that certain rooms will be have their protective blast shields down. This means that, while not directly exposed (the facility remains pressurised and airtight for the moment); the rift can be seen through the windows. This is not a good thing as it has a hypnotic quality if observed for too long causing mental disturbance. Thule knew this and the acolytes are briefed prior to arrival.

The facility should be quick enough to get in and out in an hour or two of game time, if that. It's just to run some simple combats and have a plot twist. Thanks.

Here's a handy resource that I used when I was writing up a similar story:

http://www.shipschematics.net/startrek/federation_data.php?filter=DockStation

It is a page of schematics of space stations and orbital stations from Star Trek, often including floorplans. They're not highly detailed, but they're a great spring board to do more thorough searches.

I'm sure that you could find similar floorplans and layouts from Star Wars, Babylon 5 or other sites specializing in that sort of thing.

For example, check out Space Station Regula 1 (seen in Wrath of Khan):

http://www.shipschematics.net/startrek/images/federation/spacelab_regula.jpg

Besides the help already provided, I would like to suggest the rather simple approach that was taken with a base shown in "Book of Judgement".

It is very simple: make every "area" you want to include a demisphere residing on the moon surface and connect them with "tunnel" or "tube" segments as you like.
Another option would use the same technique but place the whole station into artifical (or not so artificial...) caves and tunnels dug into the surface of the moon. Some meters of solid moon surface could provide excellent radiation shielding! .

This approach makes things easy to build since you only need to brain storm what kind of section you want/need for your station and then (in the second step) you only need to decided which section would be most likely be linked to which other section. Add some T-junction and crossrad tunnels/tubes... et viola!