The tender underframe is an unusual and complicated beast. First you have the sideframes which are actually fixed to the body. Then a set of inside bearing bogies fit inside this and swivel very slightly.
Inside the valances are a set of half etch markers to indicate the position of the side frames. These are soldered in place and then the axleboxes, equalising bars and springs fit on the outside. To fit the equalising bars (I think that's what they are anyway) I use a bit of scrap etch to space them away from the valance otherwise you miss the separation that shows up in the photographs of the real thing.
Priming is as usually carried out using an etching car primer. This showed up some minor tweaks would be required although surprisingly little around the flare.
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