I'd like to thank you both once again. It's 3am, and I have just completed the build - AND IT WORKS *pats self*
Sure, my soldering is horrible, and I'm not sure it will last long, but it works. And you were right Dark Navel - I misunderstood you earlier about the switch's led being always on even when board is off. It was actually a mistake I made while making the diagram. I hopefully managed to quickly dismantle the saber after testing it, and re-routed the wire to the correct pad. It's perfect now!
I'll post pics in the Gallery tomorrow, when I have better lighting and when I'm not tired anymore ^^
May the Force ever serve you!
Callyste