This...Is actually pretty unique! Not often I see a stocky MOC like this, but the name was poorly chosen. "Slayer" has been used so many times, I can't even count them all. Think of something original.
Duuuuude ... this is good. Really, really good. You consistently build things so that they LOOK the part. This amazes me. It's not necessarily size that makes the MOC - it's design. And this has design by the truckload. Srsly, great job.