Yes, we're trying to use WTParts as part of the top-down design effort on the bot. The one in question was created on checkin of CAD objects, but there are also WTParts that were created directly in the workspace.
If a ProjectLink-only install isn't a good place to associate WTParts and CAD objects, I can live without that. What about just having them the (WTParts) in a free-standing product structure? We're using the top-down approach for design team assignments, scheduling and weight allocations and the relationship explorer is a good tool for helping them visualize the systems engineering process.