Warhammer 40k Emperor's Children, Blastmaster design

I'm a huge Warhammer 40k fan. But it isn't reflected much, in my personal work. My favourite Chaos Space Marines legion, The Emperor's Children, use modified musical instruments as terrible sonic weapons. These will be props, in a couple of paintings I have in mind.
Here's my interpretation of their 'Blastmaster', which is pretty much as Graham McNeil describes them in his 40k novel, Fulgrim.
I've used the materials of woodwind and brass instruments, and suitably sinuous, Slaaneshi lines.