I don't know how much game time this fella will get, but I wanted to convert one ever since seeing the Forgefiend arms. I think they work great as a Dread, errrr, Hellbrute arm.
The missile launcher is from the Chaos vehicle sprue with a Defiler shield for the top. I drilled into the side of the Brute and made a small fixture there to hold it in place. The head is from the Chaos Spawn sprue; I figure it looks good as something is bound to bust out of there after Papa Nurgle gets a hold of it.
I made it into a shooting platform as most of the time my Dreads get shot to pieces trying to make it up the board. Even holding them back for defense hasn't really worked for me so mine will be of the shooty variety. I may have a couple hug near the Landraiders sometime providing cover fire as they move up.
It should be fun to paint!