I remember being really excited when I opened my first C+L Finescale EM gauge point kit. In contrast I was underwhelmed by this offering from a well known supplier of 5" and 7 1/4" gauge railways. To give one example, those check rails are just aluminium angle.In fairness I have not included the sleepers in this photo, because they are both too short and too narrow for my planned use. Instead I've substituted ones cut from tanalised roofing batten.
Although the kit is sold as being a 10ft radius LH or RH turnout I'm actually building it as a wider radius wye point. In EM I would have used Templot, but in this gauge I just went with some basic school boy geometry scribbled on the back of a scrap of paper.
The instructions it came with were also pretty dire, so I'm basically following Geoff's excellent advice on building EM gauge turnouts but scaling it up. I won't say that I'm feeling confident about the outcome at the moment, but I'm working on the basis that pretty much anything I do during construction can be undone and redone with less effort than in 4mm.