Totally agree with PaulRhB's comments, and of course, "coarse scale" works well in the garden environment (especially seen with live steam loco's where compromises for controls, gas and steam oil fillers etc have to be made) - it's surprising what you can get away with.............
This is a GRS kit, built over an IP Engineering chassis, with modified cylinders from a Bachmann "Big Hauler"
This IP Engineering Lister is sold as a 32mm kit, but moving the axleguards out to the edge of the frame allows for 45mm wheelsets
The sadly defunct Saltford Models kits were basically a few whitemetal castings and 16mm scale drawings to use as templates.
By adjusting the drawings slightly before cutting the plasticard, this Ruston is just about passable in 45mm gauge
Even the humble "Triang Big Big" Ruston is a candidate (purists and collectors look away now )
I'd like to go "Off Topic" to close this post, by saying a big THANKYOU for the warm and friendly welcome to the forum!