I've built one of these before and you are right about the saddle tank ballast showing through if you don't primer/filler it first. Mike Rayner (Smallbrook Studios) has just released a 1/35th scale version called "Gold Crest". I think he's designed an enclosed cab for the 1/35 scale version. Here's the link: http://www.smallbrookstudio.co.uk/produ ... it/9308312
I've got one and will start it once I've finished "Cock Robin", my first 1/35th scale. I'll post some photos in the "Size doesn't matter section" soon. I like this scale as the 1/35th cab on "Cock Robin" bears a strong resemblance to a Hunslet "Alice" port class.
It's great to see your building process and finishing - thanks for sharing them.