Hi Graeme,
nice that you have found us!
That's really cool, we now even have mates from downunder.
For now you are, as far as I can tell, the member who's furthest away from the origin of the 152vo-class.
Of the four boats you mentioned the ScatCat, to my best knowledge, has not been built as an 152vo-model yet. So if you choose her it would be nice if you would do a building report. On the other hand, if you think you need some help with the build, you'd better choose a boat that is often built and where every possible question has already been answered.
You could also look
here, if there might be another boat which you like even better. There's also some links to the plans. Or you could check
here if there's maybe already a model plan for the boat of your choice.