That's pretty funky - lots of detail that draws the eye.
One conversion was for a squad I was doing, I only managed one fig. Idea came from an old Chronicles of the warzone mag (issue 7,8 or 9) for Imperial Trench assault troops. These were armed with either two shot gas sprayers or a flamethrower (both template weapons, totally nasty in a confined space). I took the Trencher HMG and hacked, chopped and filed 50% of the Charger off, leaving the handgrip sections and top. With a bit of milliput and glue, I added the fuel cylinder and nozzles part of a plastic terminator heavy flamer from Space Hulk.
Looks pretty decent as figures go and a darn shame that a Trencher squad doesn't include a gas or flame thrower option (not counting storm trenchers).
Sorry about the crappy photo, its a scan. Plus my painting has improved a hell of a lot.