That's a great challenge!
When I saw the title, I wondered what the four legged quarry would be that would keep with the spirit of the McNab. I quite boringly went 'classic' and thought Kudu but then I read its likely to be a Vaal Rhebok, I thought what an inspired choice. It wasn't one I'd thought of but, having had one of the hardest hunts on my life trying to bag one of these animals, it's just the perfectly demanding animal.....and in hills as well to keep the highland feelings going.
Great idea - that'll create some exhausted but very happy guys.
FN