So here are my initial thoughts on rules for a Kroot Mercs Warband for THD. I am using as a guide the fan codex developed by the folks at the Kompletely Kroot website:
http://z8.invisionfree.com/KompletelyKroot/index.php?act=idx
The codex is available free in pdf form on the KK website, or at this address:
http://trobarts.customer.netspace.net.au/5th_ed_kroot_mercenaries_army_l...

Max Roster size: 15

Hero
0-1 Master Shaper - Captain (200 pts)
0-1 Prey Shaper - Captain (300 pts)
0-1 Shaman - Captain (300 pts)
Shaper - Captain (140 pts)

Henchmen (0-5 each group)
-Kroot Carnivores (40 pts)
-Kroot Hounds (30 pts) - may not gain experience

Henchmen (0-3 each group)
-Headhunters (55 pts)
-Hunters (40 pts)
-Stalkers (65 pts)

Henchmen (0-2 each group)
-Krootoxen (175 pts)
-Trackers (90 pts)
-Vultures (60 pts) - movement enhanced

Henchmen (0-1 each group)
-Knarloc Riders (150 pts)

I was going to do the armoury and wargear stuff, but I'll get around to that next time. Any feedback on points values, group sizes, or whatever else are welcome and appreciated!