Sadly, just because you can produce something, doesn't mean it is buildable. The parts always scale, the concepts are less reliable.
On the dock tank the cab roof is in 3 sections. According to the instructions you attach the sides and clip the centre part in as required. This way the cab interior is accessible for painting - A Good Thing. In 10 and even 7mm scales I can see this working. 4mm modellers struggle. It's another case of a prototype that doesn't make life easy for a model maker. The roof doesn't have the normal lines and instead is more like a continuous curve. Result; the tops of the sides have to bend in smoothly yet there is little metal to grab hold of to form the curve.
I fiddled with this and eventually gave up. The sides came off the loco and I turned the entire roof and sides into a single part. This was then bent up over screwdriver handles (the bend occurs just above the top of the cab doors gap) with the gentler top bend made with fingers.
All of this means the soldering had to be done from the outside. Lots of flux and tiny amounts of solder were employed to keep cleaning up to a minimum. At this point things were looking good.

Hmmmm.
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