A FEW WORDS ON SCALE
The plans for our buildings are based on a scale of 1:22.5 (G scale) and 1:20.3 (Fine Scale), so one inch on the model represents slightly over 1-7/8 feet (1'10-1/2") in real life. Some of our models are slightly smaller than the actual buildings in order to keep their footprint within reason but they will still look large when compared to plans drawn for 1:24 scale, and especially large when compared to plastic kit buildings which are, for a large part, woefully undersized.
Common scales for garden railways using #1 gauge track (45 mm gauge) are as below. Note that 1:22.5 (G scale) is also commonly used to represent US 3 foot narrow gauge. The Copy Percentage on the chart below shows how much our drawings need to be enlarged or reduced in order to match the various scales. Any good copy shop can do this work for you.
One builder had the plans enlarged for a 1:7 scale live steam layout, I have discussed the reduction to O-gauge with a few clients, and believe that could work. Reducing to any smaller scale would make the lines too faint to be practical.
Maine narrow gauge
US 36" narrow gauge
|1:22.5||1 metre (39.37")||
European narrow gauge or US 36" gauge
Canadian narrow gauge
Aristocraft/LGB/USA (no known real life gauge)
Worldwide "standard" gauge
It must be noted that standard gauge locomotives are larger than narrow gauge engines but the scales they are built to (1:29 and 1:32) are much smaller than G scale. So, items that your standard gauge engines will use (bridges, engine house, water tanks, turn table, covered bridge, etc.) may not need to be reduced in size to suit your scale. It is easy to check the size of your largest engine against the drawings to ensure that the width and height of the engine shed doors, the covered bridge opening, the turntable length and width, etc. are suitable.
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