This is what I do when I get bored with my toys
I kitbash them into something I like. Was in a very cyberpunkish mood when I was thinking of this.
This one was inspired by Monster Hunter in particular. I love skulls, shady characters, and big guns. I imagine Garindan Mk2 to have given up on hunting normal bounty and moved on to bigger game hunting (rancors, maybe). That explains the oversized MP5 that looked like it once belonged to a mech. He retweaked the trigger system to make it possible to fire with his hands. The pistol grip remains because... he's Garindan and he couldn't be arsed to remove it.
The basic idea behind the 'gorget' or the huge belt that acts like a neck protector is to both reduce the character's head size and bring more visual weight to the top. But more importantly to suggest that he has that skull on top both as a decoration, and as headgear which allows him to use it like a periscope (by fitting macrobinoculars into the cavity). I imagine an interesting scenario where he literally digs a foxhole, buries himself in sand and just lets the skull sit on top.