Hey man, welcome! I can totally see where you’re going with this, but to be perfectly honest, and this is coming from a place of love: it’s gonna be a dreadful.
Blunderbuss spam needs travel mystical pathways to function, so you’ll need a LVL 4 with elementalism and lore familiar.
Drop the detachments, they don’t do anything for you.
Get some hobgoblin meat to soak enemy attacks, in this case probably with the overseer’s sigil somewhere.
Iron daemons are king, get 1 or even 2.
Our artillery is generally not winning games, so what you have is major overkill. As has been mentioned: no loader on the dreadquakes is borderline criminal 
Check out this winning list in a recent tournament for inspiration: