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The techniques for creating surfaces provide a significant amount of flexibility in creating user-defined, free-form models. However, surface models are just that: models of surfaces. Surfaces have no depth and aren't solids. Even when the edges of the surfaces are cleverly chosen to match the edge boundaries of other surfaces, the model will not be a solid--unless explicitly defined as such.
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If you create surfaces individually, you can combine the surfaces into a volume. If there was overlapping at the individual surface boundaries, the overlap remains. All faces, edges, and vertices that are not necessary to support the topology of the solid entity can be removed.
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Some of the Scheme extensions related to solid creation from a surface are:
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sheet:2d
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Modifies a single-sided sheet body into a double-sided sheet body.
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sheet:enclose
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Converts a closed 2D sheet into a solid volume.
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