The other day, we had to drop my husband's vehicle off at an earthmoving yard. I 'just happened' to have my camera, so got him to stand next to one of the big machines. At 5' 6", he didn't even reach the height of one of the tyres!
You have to come to the Big Boys' Toys Show in October - in Auckland and I'd guarantee they don't have something like this even though the 'boys' would want to see this!
You seem to have mastered the art of display photography - I can see your shots gracing machinery magazines and glossy pamphlets. Great shot here showing scale it's handy to have a model at these times.