The GWR 43xx 2-6-0s had the same wheelbase, cylinders and motion as the large Prairie Tanks (41xx, 51xx, 61xx, 81xx) so having picked up a Mainline 53xx body and tender and a redundant old Airfix GMR 61xx Prairie Tank, I investigated if the Mogul body would fit on the 61xx chassis.
I measured the width of the Airfix motor and found it should just fit into the body.
The chassis was disassembled so that the chassis block could be modified. The Airfix chassis block incorporates large weight bl
I bought a slightly damaged Triang L1 body and tender about 30 years ago (!) with the plan to put a decent chassis under it but apart from fitting wire handrails and RHS steam pipe and carving away the boiler skirt that was it until now.
The Triang tender (which the L1 was forced to share with the Triang Midland 3F 0-6-0 and wasn't even accurate for the latter) was ditched long ago.
The project was brought back to life when I spotted a Hornby T9 loco chassis on eBay at a very reasonable Buy It