After the MGWR A class, I'm considering commissioning a 400 class. This would be the split footplate version, meaning 401 (after 1949) 403, 405, 407 and 409 could be modelled.
402 had a flush footplate and 500 cab, whereas 406 had caprotti valve gear. 401 also had this until fitted with walschearts in 1949. So these two would be the only two the model wouldn't cover in the 1950s. 401 survived until 1961.
In terms of chassis, I may look to see if the Hornby Royal Scot would work with these. Alternatives would probably be B17s or King Arthurs. The Scot would be ideal as Killian has the chassis block modelled for it. They can also still be found for under 100 quid.
You would receive the loco body and tender, and the smokebox door handle. Killian offers to print the buffers AFAIK. Killian supplied nuts and bolts to fit the shells to chassis. Handrail fittings, handrails, whistle, safety valves, would likely be separate parts though some of these could probably be printed if necessary.
My intention for these would be to purchase two, possibly three. To justify making Killian endure the torture of designing something absolutely littered with snaphead rivets again, I'd be looking for a minimal order of 8 before going ahead and commissioning these.
With my two that'd be six other required before going ahead with these after the MGWR A class.
So if you're interested in a 400, do let us know!
"Those of us who saw the last agonies of steam felt deeply with Charlie Maguire, when, his voice breaking with emotion, bewailed the passing of many 'fine engines'
Charlie was thinking primarily of the 400 class, and of all engines I personally miss them the most."
Drew Donaldson, A Decade of Steam.