Andy, you've knocked those out of the park. I've got the Chainmail Dwarf bomb thrower, but what you've done with him is brilliant!! He even matches the flavor--you got the talons on his feet. Well done.
For a rider--maybe taking a Horned Ones Legion model, cutting off the tab that goes into the base and reworking the legs would give you a mahmout; you could attach a length of chain from his shield arm/sans shield attached, to the Torkha's bull ring!! That might work, but repostioning the legs could be tricky.
All in all---great job, and karma to you.
Cheers.