Is the NAMM Foundation likely to fully fund a project or just partially fund a project? In other words, in the grant proposal would NAMM Foundation look more favorably upon a grant request that has us bearing part of, or the majority of the cost ourselves for a specific project?

A program that is receiving support from another entity is a positive
indicator that it has already earned endorsement and support from
other funders. The opportunity to contribute to partial support of a
quality project allows NAMM Foundation to spread its grant making
funds to more organizations; an opportunity to partially fund a
program or project is encouraged.