Petals Studio is an Eclipse product, made up of plug-ins that are organized as features.
As a reminder, notice that the general Eclipse architecture was described here to explain how to update the studio.

Feature organization

The studio uses 4 features, each one matching a category in the studio's JIRA.

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Petals plug-ins

Petals plug-ins are part of 3 of the 4 features.
In fact, plug-in dependencies cross feature boundaries.

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Build

Petals Studio can be exported manually with the Plugin Development Environment (PDE).
Select File > Export and then Plug-in Development > Eclipse product.
Select com.ebmwebsourcing.petals.studio/petals-studio.product in the configuration list and complete the properties before starting the build.

Notice that to build the studio for several platforms, the Eclipse Delta Pack is required.