How do I distribute a single ribbon tab and custom icons

Gilgamesh1964 

Since as Dale noted, importing your customization will overwrite any other customization the user may have created, here are a couple of ideas you might want to explore.

1. From the old MSDN Project customization forum I recall an article for customizing the ribbon with VSTO. I don't have Visual Studio so I never tried it but you can check it out at:

https://social.msdn.microsoft.com/Forums/en-US/ca3019f4-3856-4b03-adeb-bd1e6f79df93/customizing-the-project-2010-ribbon-with-a-vsto-addin?forum=project2010custprog 

2. The second thought is to create a user "how to" document so users can create and add your customization to their existing ribbon. You of course will have to provide the customized items (i.e. icons, macros, etc.).

Just some thoughts.

John