A conceptual drawing of the network is available at https://www.mysensors.org/about/network in case you haven't found it already.

@jmd I guess you refer to my thoughts regarding the interesting battery voltages after 2AAs have been drained by a booster? - No, I've not yet researched anything more on that. Did you read this? http://forum.mysensors.org/topic/2027/test-of-step-up-modules-sparkfun-pololu-china-module-any-other My conclusion is that testing is necessary to says something about the performance of these setups. My "105-test" is still going strong.