SW is fundamentally different from physical production, so attempting to emulate a model that worked for physical production is the wrong approach.
To transition a company from project to product, start with the tool network, then the artifact and last the Value Stream Network.
In network management, bottlenecks are constraints that you simply reroute around.
Flow does not need to stop as it does in a linear process. Network-based model is more representative for SW dev than a linear manufacturing flow.