We also worked for a number of years with our URCNA counterparts and were well on our way to proposing a hymn section for the "Common Songbook" to our respective synods. However, a few synods back, the URCNA changed direction and began working with the OPC instead. We were saddened by that, but I wish them well as they work to produce the "Trinity Psalter Hymnal." I look forward to seeing the final product.
I pray God may be with the current committee, and may the Book of Praise be used weekly and daily in church, school, and home to help God's people praise the Lord with psalm and hymn!