Right so, I'm just after completing the shell of the smokebox. Photos to follow as Windows Phone 8 will not work directly with the Forum upload software.
The smokebox shell is easy, but mounting it on the footplate reveals some flaws in etch design which "Weshty" might want to have a look at if he gets time to revisit the original artwork that he inherited. These flaws also affect the mounting of the front frame plates, making the job a little harder than it should be.
The real killer is forming the smokebox wrapper - you have to go slowly and carefully on this, and it helps to have the use of a rolling mill. The reverse curve where the smokebox sides become vertical must be marked out because if you get it in the wrong place, it will be the very devil to correct. I'll show yis how I did mine.....