Fantastic job young man, you are giving me so many ideas for my N gauge layout, thank you ever so much, a real inspiration, you have an eye for detail and finish.
Based on my experience I strongly recommend to make such transitions in a 90° angle and never otherwise as derailments are the result. Another recommendation is to avoid curved track for the same reason. Remember baseboards, plastic ties and metal rails react differently to variations in temperature and humidity.
Thanks for the project. You may add security relay to stop running trains when track is open. I made a bridge for train and when the bridge is open electric is cut among 1 m both ways to prevent trains falling from open track.
J'aime comment tu sais couper une courbe avec une scie droite. J'aime aussi beaucoup ton outil makita. La taille est adaptée à du petit bricolage. Bravo.