Well another little update, really wanted the boiler structure basically done before swapping back to the W1 CAD work, so after the last few nights work and progress decided to tackle the front part of the boiler and smokebox, and this is where the law of sod, the law of diminishing returns and the smart dump / balance equation crop up, e.g. when something smart happens, then something equally dumb has to occur to maintain galactic balance and harmony.
First is the law of sod, the front part was already pre rolled, no problem, except the instructions mention rivets to press out and holes to drill (marked on the inside), which basically means that it has to be unrolled to achieve the above mention work, marvellous!
So having rolled it flat enough to work on, the relevant rivets were punched and holes drilled, and the whole rolled back up cylindrical. The only problem was that the previous rolling work didn't use a backing sheet so your left with two ruddy great flat bits where the seam will be, the end result end on looks like a partially flat tyre
, despite adding a backing piece this time it didn't undo the previous misdemeanour's, not very well anyway.
So having rolled it all up and soldered the end plates in we now come to the smart dumb / balance equation.
On the right the cone section, on the left the parallel section, note special holes designed and drawn with great accuracy to allow you to bolt the two halves together for soldering square, the smart bit!
Now the dumb bit
On the left the parallel section turned the other way around showing the front, what one has in effect made is a sealed tube with no recourse to add screws or tighten nuts, just brilliant
All of which means that I'll have to cut a big hole in the front disc to get the bolts in to allow it to be soldered up all square, it's not too much of a problem as there is another disc to go on the front as a backing to the firebox door, so, why wasn't a bigger hole etched here in the first place as the two neat fixing holes are not required for anything else
Now we come to the law of diminishing returns, all of the above pales into insignificance when we get to the parallel section seam!
It's that magic 1 mm error cropping up again
I know it's on the bottom of the boiler but after all the work on the chassis this cannot go in like this, it is the right diameter and matches the cone section perfectly, it's just that the wrapped is too small. Worse yet the previous rolling with out a backing sheet has buckled the seamed edges and try as I might they really didn't want to flatten out.
So when viewed at low angles you can see this horrid mess under the boiler between the splashers, The only viable solution is to open out the front as best I can, try and straighten the seam as best possible, add a backing sheet, fill the slot with a suitable sliver of brass and attack with the monster file to make it semi round.
In hindsight I suppose as soon as the gap was evident I should of simply rolled the boiler flat and marked up a new one, riveted and drilled and rolled to suit, it may come to that, attack this with the blow torch and start again. In the above images you can also see the bleeding great hole in the cone section for the motor, really, really not happy about that at all and may even plate that and redo the rear splashers with bevelled top as noted last night, but then the law of diminishing returns is rearing it's head, how much more do you do.
Other than that, it's all going swimmingly.
I've now learned not to buy kits with pre rolled components, or to buy kits started by someone else, basically I shouldn't really buy any kits at all
Which leaves me looking at the big pile of boxes under the desk and seriously asking myself where the hell does one go from here, because, all bar one will require at least as much work as this A3 and some even more to get what I want
, then yours will be correct for the period 
