I’d leave Crewe off it and start at Chester, then have it go to Bangor for around the the same length or Holyhead if it can be a bit longer. A lot of the best bits of the line are between Conwy and Bangor.
In fact, I think in the actually page's terms it'll probably end up almost a completely different suggestion, I'll have to change up the services, stations, description, everything. I'll just get rid of this and get a replacement out.