I have been toying with the idea of LED work on some of my gunpla but to be honest, I really dont think I could ever replicate or even remember the basic electrical and soldering skills I learnt at school as a part of the 'Electronics Group' (yes, I was that nerdy at school).
Then I see something like this and those ideas get absolutely hammered and smashed into the ground, never to be heard from again (until next time I entertain the idea…….. 😉 )
Another link in case I'm feeling brave
or even this lin may be helpful
Or I could be really silly and try this (and probably burn the house down)