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The sourcecode of the Flukso is available at Bart's github page: http://github.com/icarus75/flukso. Clone it to have your own local copy. The repository contains the three parts: Microcontroller firmware, Router board software (openwrt) and the code for the website.
For the local interface to work you have to update the Lua scripts installed in ”/usr/share/lua/flukso”. I suggest that you make a backup copy. Then you simply scp the updated files from the github repository to the Flukso. If you're using mySmartGrid, you have to adjust the logging location afterwards: