More than a constitution can contain
Here are sample policies the ELCA has developed for congregations:
In addition, Appendix B of "Governance and Ministry: Rethinking Board Leadership", Second Edition, by Dan Hotchkiss contains a long list of suggested policies. Examples include Board Expectations Covenant, Cash Management, Intangible Property Protection (such as intellectual and digital property), and more. Beautifully, most of the items Rev. Hotchkiss recommends are already in the Model Constitution.