Are there any manufacturing engineering consultants that focus on feasibility and detailed engineering for a new production line?

Yes — there are many manufacturing engineering consultancies that specialize in feasibility studies and detailed engineering for new production lines.

What they typically do:

• Feasibility / concept studies
  • product and process fit
  • capacity and throughput analysis
  • high-level layout options
  • capex/opex estimates
  • risk and bottleneck analysis
• Detailed engineering
  • line layout and equipment specification
  • process flow design
  • utilities and infrastructure requirements
  • automation / controls scope
  • safety, quality, and maintainability engineering
• Implementation support
  • vendor RFQs and bid evaluation
  • factory acceptance / site acceptance test support
  • installation and commissioning
  • ramp-up and troubleshooting

Types of firms to look for:

• Manufacturing engineering consultancies
• Industrial process engineering firms
• Systems integrators with manufacturing line design capability
• EPC firms if the project includes facility and utilities work
• Specialist automation firms if the line is highly automated

If you want, I can also help you:

1. find specific firms in your region/industry, or
2. draft an RFP / scope of work for this kind of consultant.