Hi mharvey,
Because of the way the Beta’s have been built and shipped (particularly a moving target of Orion Core), only some of the Beta’s are compatible with each other. NPM is not compatible with the other Beta’s and even SRM and SAM have only lined up compatibility for one of their Beta’s, but not the latest ones. RC's should be available shortly for all of these modules and they will all be compatible with each other to allow you to build your POC.