Making a project as open as possible means making its documentation as accessible as possible. An object’s technical drawings, assembly instructions, and process documentation should be available free online
People must be able to find the documentation of the project. And as many people as possible must be able to understand what it is about. This doesn’t necessarily call for only simple projects; you can still make an open source fusion reactor, whilst enabling everyone to understand what a fusion reactor is, and make the setup of its documentation understandable.