How to model a courtyard in the design tab of Sketchbox

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There is not an explicit way to model a courtyard. What is most important is getting the correct floor area and using one or more "shells" with aspect ratios tuned to get the correct surface area and approximately the right orientations of solar exposure. The end result often looks like a "T" or "H" shaped building in Sketchbox. This should be close enough for most energy modeling applications.