I've just assembled my first piece of track from British Fine Scale, a diamond crossing 16.50mm 00 gauge, and this was my first ever attempt at track building. The precision and quality of the product was a joy to work with even though it took me a lot longer than expected. A few chairs pinged off, but that was part of my learning curve. Now we have double slips and turnouts to construct. The only point I had concerns about is the downloaded template, for the diamond, does not show the isolation gap in the same position as the wiring diagram and in keeping with other pictures in the instructions. In fact the template shows the closure rail mounted in one chair whereas the instructions shows a two chair mounting, which is obviously more stable and looks right.
I hope this is encouraging to those thinking of track building.