I'm good at the 'splianing. ;D A 12V would indeed make a large hilt. 8AA or AAA's is the most viable.
I know a fairly easy way to run a 5W off of less making an MR board much easier, but like I said it would require Ultra stocking more parts. I could tell more about that if anyone is intereted, but this definatly getting off the topic of Darth Maul conversions, lol.