Paddingtons cabin is indeed original, although much repaired! The line of rivets above the gunnel is a repair I am guessing carried out when a maintenance boat on the NE waterways, where it went around 1950, this is a long plate on the inside which folds under the gunnels as I'm thinking the bottom edge of the cabin sides was going into holes. On restoration in 1985 by GM engineering steel gunnels were fitted and the lower part of the cabin sides were repaired, the extra repair plate staying in position. The engine room top is removable, I've changed the engine a couple of times! I have a series of photos, courtesy of GME, which illustrate all this.