Engineering Project Roadmap Template

flowchart TB
    subgraph E1[Requirements and survey]
        direction LR
        A[Requirements analysis] --> B[State of the art survey] --> C[Technical specifications]
    end
    subgraph E2[Concept design]
        direction LR
        D[Overall concept] --> E[Key technology studies] --> F(Design review)
    end
    subgraph E3[Detailed design and build]
        direction LR
        G[Hardware / structural design] --> I[Prototype integration]
        H[Software / control design] --> I
    end
    subgraph E4[Testing and validation]
        direction LR
        J[Unit tests] --> K[System integration tests] --> L[Field trials against specifications]
    end
    subgraph E5[Delivery and wrap-up]
        direction LR
        M[Refinement] --> N[Delivery] --> O[Technical report]
    end
    E1 --> E2 --> E3 --> E4 --> E5

Draw an engineering project roadmap in Mermaid flowchart TB syntax for the project [project name]. Five subgraph phases with the phase name in square brackets and direction LR inside: Requirements and survey (requirements analysis → state of the art survey → technical specifications); Concept design (overall concept → key technology studies → design review, rounded node); Detailed design and build (two parallel chains, [hardware / structural design] and [software / control design], both leading to prototype integration); Testing and validation (unit tests → system integration tests → field trials against specifications); Delivery and wrap-up (refinement → delivery → technical report). Connect the phases by their subgraph ids (E1 --> E2). Output only the mermaid code block.