For what its worth, I used the Dialight 51513020125F (datasheet) on Joulescope. It’s good enough. For one LED, its relatively easy. Drill a hole the right size and try different light pipes to get the right look. As @coflynn says, you do have to worry about light leakage with multiple LEDs.
Depending upon how picky you are, light pipe design can be complicated. You can end up with “hot-spots”. Creating even light from all angles across the whole light pipe surface often requires more diffusion or bouncing the light. From past product experience with the Hillcrest Loop where the acrylic part had to light up just right, getting the exact illumination and diffusion requires design and experimentation. We had a great MechE do a bunch of experiments.