[Espeefan]

There aren't many 1/16 scale die-cast construction models out there. Most of the modern, big equipment, would be huge in 1/16 scale, and so I don't think a lot of manufactures are really interested in starting a market like that. That's why you see so many 1/50 scale models instead. There are a few 1/16 scale machines, like Bruders (plastic), and a couple Ertl models, and NZG has done some of the Caterpillar Challenger tractors, but otherwise the pickings are pretty slim.

I do remember a youtube video, of a guy who converted a Norscot Caterpillar D11R Carry Dozer to RC. That was 1/50 scale. I'll bet that was a real challenge.