The challenge with this is that you have ~7 defined boxes that you are trying to put a team of 7 individuals into ( or 7 roles and 13 people ). At any given point in time there won't be work commiserate with all 7 job functions, people will grow to a different role, someone will be the bottleneck, and someone will be MIA or in a backfill.

It's often best to keep the number of roles low on the team to increase flexibility/provide freedom for individuals to tailor the roles to their own strengths.