. The phi-menu has been rewritten and expanded to the phi_prompt smiley Please find the most recent phi_prompt library here:http://code.google.com/p/phi-prompt-user-interface-library/Get the 1.0 pre-release and the doc of the previous edition. I am still working on the new doc. The library comes with plenty of sample codes to get you started.
Only concern about your plan I have is that if you use i2c master slave, then the slave end can't read its RTC since the RTC is on i2c and a slave can read at will. Have you thought about that or do you only need RTC on master, which is fine?
The RJ45 Porto should take care of connecting things up at long distance.