Hi Mikee,

The project is hosted on sourceforge: https://sourceforge.net/projects/rflink/ (open source)
It works very well and costs next to nothing to get started with.

Just grab an Arduino Mega2560 and a RX/TX set.
Various receivers/transmitters/transceivers have been tested. Like "Aurel", "Super Heterodyne""RXB6" and "SYN480R"
Or get the PCB from the link you posted.. that one also has a NRF for 2.4 ghz communication.. support for that is under development.. If you have any questions we are here for you to assist (forgot to mention.. its our project;)).