the setting for the face plate are “light box” setting and the filament is “light box” setting as well. i find this works the best but light boxes are difficult to print as is so trial and error. i made the light box face with a 10mm lid lip to try and not use glue as i don't like gluing.

for the back plate i would change the setting to default bambu setting and the layer height on .28 for that. the back plate does not need detailed work and cand be made on the basic settings. make sure to place the hole for the lights where you want it. 

also print the colors from lightest to darkest