I played dwarfs years ago
The Rune of Might is sort of wasted, you already have a great weapon. Might as well use it on a regular axe and throw in an extra attack or something, still hits strength8 against any grizzlies.
the magic resistance runes won't help that much either, you only get 4 dispel dice, against anything magic heavy you'll be blown out of the water.
Drop the thunderers to quarrellers, if you want the points. Crossbows have the same strength and longer range, ideal for picking off warmachines and the like, an organ gun is quite effective at taking out anything high-armour, unless we're talking about a death-star unit, but thunderers can't beat that either.
Bolt Throwers are mean, yeah. but at the price you're paying it might be better to invest in a cannon instead. Rune of Forging it and it'll near enough never misfire.
Your BSb is kitted out the same I have mine. very pretty.