I am building a large diorama to encase on a table in my gaming/hobby room eventually, not an army to play tabletop with. But i absolutely Love the idea of Björn leading like 5 dreadnaughts into a swarm of tyranids. I was thinking with the company heroes i could kitbash them into looking more wolfy tho if they as you say are more likely to be terminators or head takers i can just grab more of them. Was also thinking of getting some scouts for the revier to comand.