Ah, well, you see, all Masons can be divided into two styles. The laser cut chassis, and all of Fletch's drawings and written material, covers the SECOND one, the one with Walschaerts valve gear and the over-the-boiler reversing linkage. The Torch Lake is an early style Mason, with Stevenson valve gear, and regular reversing linkage. There are a fair number of Harald's parts that you could still use, but there are an awful of little fiddly bits that you would have no use for.
I know that because I was, and still am, tempted to build the "pre-fire" Torch Lake, as it and I spent our earliest years in Northern Michigan. But I gotta get my Breckenridge-style Mason done first.