It really isn't very Orky in design, the legs are all indentical, more slender and rounded than the Ork style. Its not an Orky vehicle. As for leg armour, Ork's don't have much more than an armour plate (with spikey bits) crudely bolted on to the legs on any of their current walker designs.
Thats not to say an Mek might not tinker with it to make it nice and Orky, but as it is, its very much its own thing with clear cues from Imperial vehicles.
Saying you could make a cool Looted Wagon from this is not the same as saying its Orky.