Splitting/ rerouting connections

I've got an interesting problem and have been trying to figure out how ot best solve it. I'm building a file server for my entry (basically the part of my dorm I live in) and need a way to get the users to access it. The first try was simply putting it on MIT's network, but the server's bandwith usage killed the entire dorm's network...so scratch that hehe.
Here are a few options and my thoughts on them, reccomendations would be greatly appreciated:

1) Set up a wireless routers throughout the entry that all connect to a router that has the server as its wan.
Pros: Easy.
Cons: Somewhat costly, the wireless routers will interfere with the current ones we have and I will get into trouble. Also, it seems like the wireless route would be rather slow...

2) Drill holes through the walls and install a second hub in each room with direct access to the file server. All of these lines run into a switch which then connects to the file server.
Pros: Fast and reliable.
Cons: VERY hard to do as these walls are thick as hell, I'd need a lot of cabling, and it's a pain for users to have to constantly switch around.

**3) First an explanation of how the network here is set up:
All users' hubs in my entry connect to a large switch that then connects to another place on MIT campus that I don't need to care about.
What I was thinking is if there is some kind of ethernet splitter so that every users' ethernet cables get split into 2 where one goes into MIT's network switch and the other goes into a switch connected to the file server. If users could then (through a device, maybe a counterpart splitter?) choose which connection to use, that'd work beautifully. The networks wouldn't be able to see each other. This seems like the best solution, but is it possible; do such devices exist?
Pros: Easy.
Cons: Is it possible?