The cab interior frame work is in and to be blunt, I'm in two minds to progress it further, it adds but also it takes away whilst adding to the complexity and difficulty of the build. In an ideal world you wouldn't start here.
The frame work is currently in three pieces, necessary to get it inside a cab already built, no doubt about the cart being before the horse here! What is abundantly clear is that it's better off being fitted way back at the start when the cab sheet is flat, nothing I can do about that in this situation but that's the way forward and the artwork has been revamped to suit that method. Fitting it now also makes in near impossible to clean up the ugly solder, it's smooth and will take paint but for photography looks a dogs dinner.
It covers the rivet holes nicely so that's one plus but to cover the grooves for bending requires a false section of plate work to be added above the side windows, which is not prototypical. Thus, the choice is the inside of the cab looking like Ypes in 1916 or clean with an incorrectly added plate. I could extend the plate up to the next bracing in the roof so visually it'd look like the cab roof underside, but you'd loose half the depth of the ribs.
The only down side to adding it when the cab is flat is that you have to then bend it all with the rivets pressed out as these need doing first, you can't add it after the cab is bent as the inner piece grows due to the shorter radius so it ends up too low around the window areas, lesson truly learnt with even three smaller pieces.
Still the photos, still need to add a large baulk along the top of the side windows which will close that area there better.
I've a couple of spare cab sheets here so will try a MkII on these and see how easy it is to bend up and maybe one of the test etches will have full sheet work above the windows to see what the reduced rib height will look like, rubbish I expect
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If one were to start on a green field site then the external skin would be a half etch piece with the rivets already etched on the outside, to which an internal etch sheet with the ribs would be sweated on, no half etch holes or slots for bending to cover. There'd be no risk of damaging the etched rivets whilst bending to shape either.
MD