Simon,
I've split the skin from the core but the special slots designed to hold the skin neat and close to the core worked so well it took a blow torch to get the two apart, which resulted in the the skin buckling from the heat so it hasn't gone back perfectly flat.
The inner core straightened reasonably well, but that's the bit you don't see so isn't visually important; but the skin has creases in that just cannot be removed. Ironically if it were in brass, which is more malleable, then it probably would of smoothed out much better; NS once creased is basically scrap.
It's cleaned up as best possible and I'll show some photos later once the smokebox top fences and sand box fillers are fitted, but it's lost a fair few etched rivets back there and the idea of this build was for a demo model eventually, can't put this on any table in reality, as a show and tell, yes; as a final product display model....no.
There was always going to be a MkII, in fact, during this build the tweaks needed have already been done, so a MkII etch is already to send for the current parts, all I needed / still need to do are fill the outside of the spare sheet with other nick nacks for the casing.
You're right, the real engines were pretty battered but as often mentioned, it's just not good cricket replicating that in model form
On a positive note, the whole exercise has shown that it is perfectly feasible and practical to design a kit in Gauge 1 using Gauge O techniques and build practices and I do much prefer working in the larger scale if I'm honest
MD