The "Jeep" could also lend itself to a "hybrid" project - Hornby Fowler 2-6-4T boiler and chassis, Bachmann "Fairburn" tanks, footplate and possibly the bunker, Hornby Black 5 driving wheels.
Interestingly, the regauging was apparently done by whipping off the driving wheels, removing the tyres, turning the centres and crankpins around, then putting the tyres back on. This was sufficient to fit on the 5ft 3in and the frames and motion were not touched in any way!