Looking for some tips, especially when it comes to materials, necessary to dynamically pose a dreadnought.

I'm building two right now, and I really want to vary up their appearance, maybe raise a leg into a bracing position for the riflemen.

As for the arms, which I'll likely never use I want to see something other than straight ahead, I'd like to play with them and their positions. Similar to what Beamo went for, now it doesn't have to look like Beamo's Bjorn, but I'd like a few ideas.

I'm not bad at conversions, but I just don't want to ruin a 50 dollar model without some game plan, I'm not dealing with Orks here.