Not going to lie, was expecting this part to be a complete nightmare. Instead, fortunately it was only a partial nightmare
As usual needs quite a but of cleaning up but I'm pretty happy with the "roundness" of it. I did have to re-bend one end where the change to flat ended up about 1mm too soon. By my calculations, the diameter should be 22.5mm (2'9 3/4" radius according to the drawing (I'll be honest - this is the first time I've actively used the drawing to work to a dimension - everything else has been on a "it looks right" basis). I measure it at 22.1mm so I'm a smidge under - but then it's not painted yet.
Unfortunately the boiler barrel smokebox inner part is oversize - even after I've started thinning it down it's still 22.3mm. This is where I'd like a lathe!
The smokebox wrapper has half etched rivet detail but I chose not to do this as the example I'm building has flush head rivets (the preserved 69621 has dome headed ones). Strangely even though 2600 has flush rivets (as built), 2612 (in a BR photo at least) has dome head. Oh my, I'm turning into a rivet observer I presume the next step is to count the damned things! I guess as boiler changes occurred the exact arrangement would change. I'm building mine at 10 years old so hopefully but not necessarily it still had its original boiler. I've not had any luck finding later photos of it so just got to hope really. I'm not going to gettoo upset if I find it's wrong. What's the phrase? Layout loco
Oh - and I've reached a milestone. I've worn my first scratchbrush out.