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Ha, yeah I was on the train on the way home and realised the same thing! If you lose the power to the receiver then they won't operate anymore. A sneaky workaround would be to wire into each receiver's power a wire that carries a very small signal, like 0.0001. Should be just enough to keep the receivers updating but because the power is so low the output signal will have almost no affect on the result. Might allow you to get rid of the nodes.
Also another thought was that receivers are slightly more expensive than transmitters because they have zones to think about. The communication is two-way between transmitters and receivers so perhaps you could invert it so that each cell uses 4 transmitters to detect its neighbours rather than 4 receivers. Might make a difference in a level with hundreds of cells.
Be sure to update us on the end result when you get to i!
thanks
Matt