These guns look good on nobz, I'd cobble together a few more barrels onto them though for flashgitz. They also have a few bionic bitz you might could use, along w/ some steampunk backpack bitz that could be something else.
This site has a larger selection of ork stuff. Note when the description is "bulky" that means nob.
Shortening the box set barrels is a good idea. Despite all the added extra stuff I found they were too uniform for my liking. I've always felt that when you look at a snazzgun you shouldn't know what it is, what it does or how it works.
I found the gitz & nobs don't quite fit together as seamlessly as one would like, but you can definitely make a good mob of gitz out them.
"I guess...Grot...you just gotta hold that ol' snazzgun in your hand and it all comes clear to you like it was for me that first time. That's when I knew my one true calling in life.
"And wut's dat Boss?"
"I'm a natural born
"Ask yourself, this is the age before mechanical weapons. How long does it take to kill 70,000 human beings with swords and spears one at a time? The answer seems to be about 6 hours." Richard Gabriel