That feeling you get when you are itching to have a go at something... only to find that someone else has already done it.
Great find though! As it happens the originator of the project doesn't seem to provide the source, only the executable code (which is his right, if he so wishes) but it means that I would have to create my own version of it anyway in order to add the transmitter tuning functionality I mentioned, which of course his will not do as it aims to be a faithful clone of the IF-150 and no more.
That said, even if I just loaded up my Arduino Uno with that code that would give me an infinite amount of output traffic to analyse so that I could write something to produce the same data with the same timings.