Ride out Cavalry!

I did some fun design sketches this weekend. My last few sketches have been a little hi-tech so I'm pushing back toward the WWI/steampunkish feel. I REALLY need to give rivets a cavalry unit and heavy infantry unit. So many years working on RTS games, I just can't think any other way :) So I thought Rivets on little Rivet horses would be super cool but a friend suggested instead something more mechanical. Maybe the allies have horses and the blight use the mono-wheel? And heavy infantry came from looking at old school diving suits. Let me know what you think.