6mm Glass and Cummins Tripod vs. Four-point Mount

While aboard Hjortie #33 yesterday I noticed that the pilothouse drop down windows appeared thinner than 10mm. Also that the waterlift muffler is like Nellie's #63 (i.e. vertically mounted just aft and starboard of the engine and in a space cutout of the starboard water tank). The tripod front engine mount is identical to Titan #31, Sally W. #42, and Knock Off #66. By the time Nellie was built the engine's tripod mount had been replaced with conventional corner engine mounts. Hjortie has a second pilothouse-to-engineroom floor board, that doesn't appear to be factory installed, directly over the engine. I assume this was put in to facilitate the new engine installation.