Little Engines had a C-16 in 2.5" scale about 5 years ago during the relocation trek from VA to CA via Ignacio, CO. I think the C-16 parts (along with #50) stayed with the fellow in Ignacio. Unfortunately, I do not have an address.
I want to say they were the Mammoth Boiler Works but I have not found an ad for them in several years. When I last saw the ad, they were in Durango. I wish my back issues of Modeltec and Live Steam had not gotten distroied by water.
I also seem to recall that they were moving into amusement parks sized stuff - 7.5", 15", 24" gauges. As I recall, they took 2.5" scale and larger and Little Engines/Locoworks took 1.5" scale and smaller.
Doug