Not bad for a first add-on.
I made this.
It has custom sounds, I made this for Hydralisk because he asked for it. When you spawn it on a brick it's a model of a lightning bolt, but when you equip it it's an emitter. Also, this is the first weapon to have a light attached to it, so you don't want to use it in the dark! All emitters are new and can be used on bricks. If people like this I'll make more.

What's that in the fourth pane? A super secret mod I'm working on that actually doesn't give it much justice?
Nah... No way.