Regulars will know my penchant for old kits and other items of vintage. This is the latest. There had been some discussion on signal boxes for Rhiw 2 and the modern timber clad structures such as Radyr were mooted.
While looking for photos for something else, this pinged up: Tri-ang but Hornby boxed and 40+ years old - what Kent used to produce before variants. Footprint wise it closely matches Mr. Hill's initial sizing, but is to my eye a wee bit short. This is not a problem as it could be jacked up easily enough. I've never seen one of these detailed up, though the mouldings are crisp and better than a lot of the resin things that they push out now.
The problem will be separating the two parts which are pretty tightly welded together. I'm thinking multiple light passes with a very sharp knife and a waggle. The brickwork would be treated as normal and closely matches the Slaters for size, but is plain bond. There looks to be a false floor on the red bit so an interior could be built up on this. The steps at the rear need a tubular handrail or similar. Even if it doesn't work I'll have succeeded in winding up all the collectors by chopping up a mint boxed vintage model.
This via James F. and Phil's blog from 2014: