How big, corrugated metal skins or fabric, any idea what engines?
The best known Tri motors are probably the Fords...which have corrugated metal skins.
A modern copy of the Ford was the Bushmaster, built in the 70s. A quick clue to the difference is that the Bushmaster had cowlings on their engines, the Fords didn't.
Stinson made two types: high wing and low wing, both were fabric covered, however.
A company named Kreitzer made a much smaller, all metal Tri motor, with Kinner radial engines...so a total of 300 hp.
MTV