Stu
A few more things to consider:
-the car is a 5.0ltr chassis, therefore it must be registered by 31st December THIS year, as the 5.0ltr Windsor no longer passes emissions after this.
- Do you have the time to put into a project like this to meet this time frame?
- Do you have the experience to be able to do the necessary assembly work?
- Do you have the finances to make this happen in such a short time frame? (you can whisper the answers to yourself...

: )
I know that if I was to build my car again, I could do it much quicker the second time around. My car has so far taken me 4 years and 9 months to get this far and I'm still not over the line yet, so unless you can answer yes to all the above questions, I'd seriously think about buying this and instead look for a completed car.
It could perhaps be converted to run a different(read complying) engine setup that would stretch your timeframe out a few years, however it would cost serious dollars and would require expertise that many people (like me) don't have.
I think this car will end up either going overseas, completed as a racecar or bought back by the new RF for completion as a demo or as a parts.....
Cheers