Thanks very much for the replies, as a result of your advice I have now ordered all the components. From four Australian stores and eBay (naturally). I had to resort to eBay for the older components (MC12095, MC10E016 and NX2301P).
It has proven quite a task and taken me over 6 hours in total to order the parts for the frequency counter and the allied "deluxe" GPS 1pps timebase. Now looking forward to receiving all the bits and the assembly.
Dave made comment recently on the Amp Hour on how the internet has transformed the gathering of data, essentially doing away with the paper based data sheets and in education. I absolutely agree, I have learnt so much over the past couple of months using YouTube and various blogs etc. It is actually entertaining watching Dave, Ian Johnstone, Gerry Sweeney and "Mike" to name a few.
Thanks again for the advice and I shall post something after I complete the Frequency generator on the experience.