Good to see others building their own track to fine scale standards achieving excellent results. I am interested in your views on building turnouts using the 00-SF gauges (the UK way) and the other method you used for the AMRA fine tolerance track.
I have noticed no one has answered your question so far.
I' haven't built any points using the OO-SF gauges, but seeing as the dimensions they use are almost identical to the AMRA fine scale ones, I don't really see a practical need to try both.
In all honesty the AMRA dimensions are so close to the OO-SF ones (we are talking 0.06mm here on gauge and 0.01-0.04mm on flangeways) that I can see no practical or visual difference in them.
I'm a very black and white kind of person when it comes to things like this, and having no membership in either AMRA or NMRA or any deep seeded feelings towards either of them, I simply came to a conclusion as to what was best for my use.
My wish list was simple with the point dimensions.
Have the finest flangeways possible whilst still being able to run the typical RTR wheels be they 110, 100 or 88 width (either NMRA or AMRA profile or whatever the Chinese give us) and operate as faultlessly as possible.
The NMRA dimensions are wider then the AMRA ones, so the flangeways and frog area are wider, and even Tim Werris from Fast Tracks who supplies those great jigs, advocates changing from the Std NMRA flangeway dimensions for smooth running with code 88 wheels.
The irony with this discussion is, that someone like Tim who manufactures point jigs to NMRA dimensions, openly admits that with finer wheels you need to alter the "NMRA" dimensions for them to work properly.
The clincher for me is that the AMRA fine scale dimensions (and OO-SF) save this problem of two sets of flangeway dimensions by thinking outside the square and forgetting the carved into stone old world NMRA dimensions, whilst at the same time giving equally as good running and reducing the drop through the flangeways you get when using 88 width wheels and NMRA dimensions.
If you want to read about a true poo fight of a standard, have a read of the discussion about the club layout being built to DOGA fine scale standards.http://www.modelrailforum.com/forums/index.php?s=d83523aafde750969d0af6dcbbd183c1&showtopic=14372&st=0
For those that don't know, DOGA advocates to make the flangeways smaller you have to increase the back to back to 14.8mm, so basically no RTR stuff will run on it as is!
So the two options put forward are OO-SF, which has the same sized flangeways but will run RTR wheels, or DOGA which means you have to change the back to back on everything you have. It also means that on the non scenicked parts of the layout they cannot use basic Peco points to save having to build them. Again, I see no logic in defending a std (DOGA) that makes no sense at all when there is a simpler solution.
I think sometimes it really is a case of not seeing the forest for the trees!