Scourge Haywire blasters

What are people doing to get there 4x HWB on there scourge?

Found this so far.

http://www.dakkadakka.com/dakkaforum/posts/list/403965.page

What is everyone else doing? buy from Bits stores?

Hoard o bits. Also Talos tail weapon + converted heatlance.

I've done the same thing as that guy, but with the splinter cannon as well for the third HWB (shaved a lot of the sticky-out bits off, and shortened the barrel) and I've been using the sheathed scourge knives minus handles for the thingies at the end of the barrel.
They're a bit more gaudy, but I think that helps, because they look really obviously the same kind of weapon and it stops you focusing on the differences between the guns.