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So I decided to branch into BCR with three Start Collecting boxes. I was thinking of building the following:

Leaders:
Frostlord on Stormhorn
2x Huskard on Thundertusk - Both equipped with Vulture to guarantee one mortal wound from each unit instead of a 33% chance (before saves) of doing damage with 12 or 20 inches

Units:
2x Mournfang Pack - Units of 4 with Gargant Hackers. The Extra range on the hackers allows the large unit to take advantage of the the increased model count
2x Mournfang Pack - Units of 2 with Clubs. The non-unit leader will be a horn blower. The idea for these units is to be harassers or objective grabbers.

What are your thoughts on how to build/arm them?

You seem to understand everything well, I wouldn't change anything.