Thanks, all!
Here's some progress on the 15mm HOTT army - a couple of orcish hordes. Very quickly done: I based them before painting for speed. I want to get at least four more done before the tournament.
The army's currently on 12 AP, so half done. But two more behemoths are just about there, which would take it to 20 out of 24. Four more hordes would finish it off.
I'd prefer, though, to just use two behemoths and add either some beasts or some more warbands. The HOTT rules suggest that wolfriders should be beasts, although the army list at the back has them as riders. I think beasts are a better fit, given movement through bad going and effects on cavalry. So, if I have time, I'll add an element or two of those. I think two behemoths, four warbands, six hordes and a beast element would have a nice balance of numbers, power and versatility.
Also, these two horde bases make up a unit of light or bellicose foot in Dragon Rampant. I'd probably split the 12 similar goblins I've based on pennies for D&D between them, though, to give two units. That gives scope for adding more archers for mixed-weapon light foot, or more axemen and burly types for offensive light foot or bellicose foot.