You mean the actual arrangement of which rooms go where? No, there's not really a 'standard' per se, most of that is determined by a variety of factors relating to the components themselves. The major things you'll need to consider -
1. The bridge or control room - This depends on the type of ship you're designing. On a military ship, it makes the most sense to put the bridge as deep inside the ship as possible to prevent battle damage. On a civilian ship, close to the skin of the hull is acceptable, usually with viewports to see outside unaided.
2. Crew living areas - these can be set up most anywhere, but I tend to place them where they give easy access to the engineering and bridge compartments. If there is an emergency, you don't want the crew to have to run long distances to man their workstations or damage control stations.
3. Passenger living areas - again, they can go most anywhere, but my general rule is to work on isolating them from the bridge, engineering, and crew compartments. Even on civilian ships, it helps to prevent hijackings and passengers wandering around randomly pushing buttons.
4. Troop living areas - can go most anywhere, but my preference is to locate them close either their armory or boat/vehicle bay, to minimize their time to deployment. If you can position them between secure locations and other passengers, they make a great buffer and enhance security.
5. Medical facilities - depending on the function of the ship, I put these either near the passengers for easy access, or near the core of the ship on military vessels to prevent damage. If the ship has low berths, its usually a good idea to keep the medical facility nearby.
6. Cargo areas - depends a lot on the design of the ship. You want to make sure you have a big enough hatch to get cargo in, and enough area to move around once its loaded.
I would follow
this link - to the Deckplans section of the Files on the site, and download the PDFs done by magmagmag. He does excellent 3d deckplans, and he has a very good sense of how things should be put together. He also has full 3d views of some of the compartments that you may be able to use. You noted you were filling in a Beowulf template, so I'd suggest starting with the
A-110 Free Trader.
The A-110 is mags version of a Beowulf, albiet a bit different than standard.
If you have any other questions, feel free to ask. This bunch is generally very helpful.
