Looks like a project based roughly on the Hammond Lumber Co./Arcata & Mad River No. 12, a 2-6-6-2 articulated built by Baldwin in 1929. 30" gauge isn't exactly prototype, but it does look like an exceedingly neato beastie that I'd be proud to own--looks like all it needs is a paint job!
Such creatures were used late in the era of steam logging--I think that one ran until 1959 on the A&MR.