The base is made from an off-cut of steel plate, but actually, any metal or even wood would be acceptable. The base should be reasonably thick, to take the frame mounting screws which are countersunk underneath.
The rounded corners and mounting holes are optional, but the holes are useful for mounting the engine to a larger base as part of a steam plant, or in a model boat.
Each of the holes should be measured and marked out carefully before being centre punched and then drilled to size. When drilling holes, a small pilot drill is a good idea to start, as it will 'pick up' on the centre punch mark more sensitively. Then progressively larger drills can be used in steps of about 0.2mm, until the final size is reached. This should be produce holes in the correct location.
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