My home sensor network is documented here:
part 1 - http://rheslip.blogspot.ca/2014/09/mysensors-internet-of-things-project.html
part 2 - http://rheslip.blogspot.ca/2014/09/the-mysensor-iot-project-part-2-some.html
I implemented a custom network controller using a Mega1284 (lots of SRAM and flash) and a dedicated Mega328 to run the sensor gateway code. A cheap ENC28J20 SPI ethernet module connects to my LAN and the internet. I monitor what's happening with a web page on the LAN and Twitter when I'm not at home. Works really well!
It was easy to get the sensor nodes working by modifying the example sketches. I used the sample node.js controller code as a guide to write the Mega1284 controller sketch.
Still lots of things to do and ideas for expanding the network. I would never have attempted something this complex from scratch - kudos to the mysensors crew on a fantastic project!!!
Rich