It's not bad at all!
What you may want to remember is DSL =/= Ironforge - DSL Bars aren't great as extenders here. I'd use some extenders as the arm and curve it slightly (RedAce did a good example of this maybe yesterday?) so that the chance of you hitting with the arm is lessened.
As it's a LW, adding another weapon system would be dumb, especially when a lot of the components your using are already 'light' ones. Just make the hammer even more brutal. :)