On RF Only Inputs - Video Composite to RF convertors are simple and cheap to buy at Radio Shack or the like . . . .
Not sure if anyone has ever tired to scale Myth on the level you are talking, would be interesting. Start with one Master Backend, make all other backend slaves. Probably best to centralize all your storage. With the number of tuners and possible live streams you are talking about you can use a Terabyte easy. Think RAID 0, for speed, this is TV, you don't need redundant or rebuiladable, you need FAST. A Gigabit Ethernet between each backend and the storage server(s) would be good.
I would be concerned about fully loading 6 slots w/ PVR500's (assuming you can find a good 6 slot MB, as they are increasingly hard to find). Most MBs start sharing IRQ's if you have anything more than three slots full. Not to say for certain that it wouldn't work, but you might want to be aware of this possible risk.
The least expensive workable front-end I know of is the Hauppauge MediaMVP w/ MVPmc. (http://mvpmc.sourceforge.net) Not nearly as nice the standard Myth frontend, but allows viewing of recorded and live TV. You can pick these up for probably $75 each, maybe less if making a bulk buy. Hopefully you have Cat5(e) networking throughout the building already.
Forget HD, you would need $300-400 frontends to handle playback. If there is a large HDTV or two in the facility maybe go for a combo slave backend/HD capable frontend box in that location only.
BTW, not sure what you are really up to, but in a dorm or apartment scenario this could be viewed as rebroadcast of copyrighted material, not to mention sharing cable subscription with potential customers, both of which could get you in very hot water depending on the scale of the fraud.
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