An Integrated Financial Model is pivotal for the Large Packaging company in navigating the currency crash and funding its business model for profitable continuity in Nigeria. This model should intricately link the company’s financial statements, performance metrics, and assumptions to simulate various scenarios under different market conditions.

Given the diverse SKUs and the operational complexity of running 21 machine lines, the model needs to capture the nuances of production costs, energy consumption, and variable demand. It should factor in the fluctuating input costs (at least 17 as mentioned) and allow for Scenario Analysis to strategize on the optimal mix of SKUs per machine line. Furthermore, integrating currency impact analysis will enable the company to assess and hedge against the risks posed by currency volatility, which is crucial in a country like Nigeria where currency fluctuations can significantly impact operational costs and profitability.

Cost Reduction Assessment is critical for the Packaging company to navigate the halved demand and optimize operations efficiently. With low contribution margins, the focus should be on identifying areas where operational costs can be minimized without compromising quality.

This includes evaluating the energy consumption of the 21 machine lines and exploring energy-efficient alternatives or renegotiating energy contracts. Bulk procurement strategies for inputs can leverage economies of scale, potentially lowering per unit costs amidst a challenging economic environment. Additionally, streamlining the SKU portfolio to focus on higher-margin products or those with stable demand could reduce complexity and associated costs. Implementing Lean Manufacturing principles across the production lines can further eliminate waste and improve productivity, directly contributing to cost savings.

In the context of currency crashes and volatile markets, Supply Chain Resilience becomes crucial for the Large Packaging company. The focus should be on creating a flexible and responsive supply chain that can adapt to sudden changes in input costs, demand, and other external pressures.

Diversifying suppliers to mitigate risks associated with reliance on single or limited sources, especially for critical inputs, is essential. Building strong relationships with suppliers and integrating them into the planning process can enhance transparency and collaboration, leading to more reliable supply chains. Additionally, investing in supply chain technologies for better forecasting and Inventory Management can prevent stockouts or excess inventory, both of which can erode margins in a high-volume, low-margin business.

Strategic Planning is essential for the company to redefine its business model and adapt to the new market realities. The company needs to conduct a thorough Market Analysis to understand the changing demand patterns and competitor strategies.

This strategic planning process should involve revisiting the company’s Value Proposition to ensure it meets the current market needs and identifies new opportunities for growth or diversification. Considering the halved demand, the company might explore new markets or customer segments, develop new products, or add value to existing products to attract a broader customer base. Engaging in strategic partnerships or exploring mergers and acquisitions could also offer pathways to accessing new markets or technologies, bolstering the company's competitive position.

Business Transformation is imperative to address the company’s challenge of operating in a high-volume, low-margin industry amidst economic instability. This entails a comprehensive review and overhaul of key business processes, technology, and Organizational Structure to align with a more robust business model that can sustain profitability.

Emphasizing process optimization and automation where feasible can significantly reduce operational costs and improve efficiency. Additionally, adopting advanced analytics and IoT for predictive maintenance can enhance machine uptime and productivity across the 21 lines. Cultivating a culture that embraces change and innovation will be key, requiring effective Change Management practices to ensure buy-in and engagement from employees at all levels. This transformation should be guided by a clear vision and a strategic roadmap, with the flexibility to adapt as market conditions evolve.