It's for a 1/5 Corsair. I took a hard look at instruments and since they're individual parts already enclosed in a "bezel" I could not light it from the side, plus the clocks look real nice as is and they show well in the ambient light. Probably the best option would be to illuminate the panel from the cockpit side so it shows a bit more, sort of like the "theatrical lighting" that is used in movies for an inside of a car to see the actors better.
I noticed there seems to be a light source in the real thing to illuminate the panel (see arrow in the second pic), that inspired me. I'll go with that option then.
Thank you for your insight. Now that I know it exists, maybe I'll use the fluo sheet in another project .