Unusual Financing: Looking for Ideas and Suggestions

Sorry for the long background, but it's important for the discussion. I'm consulting to a small US based, 15 person technical services company (The Company). It is in the advanced materials space. They have a unique technology, that a "Global 2000" firm (the US subsidiary of the Global 2000) has decided to develop 3 plants around. Each plant costs $200-300M. The plants are to be in the US, EU and Asia. The "Global 2000" firm does not want to build or own the plants, but has guaranteed (by contract) to buy all output of the plants for 15 years. The Company is working with local partners (ABC, XYZ, PQR) in each region to build the plants. The plants take 3 years to build. Each local partner will provide the project financing upto ~70-80% of the cost, leaving 30% equity financing. The Company has an option to participate in the equity financing on 20% (80:20 basis of the equity) for each plant. The equity options for The Company range $8M to $20M, for each of the three plants. The Company is looking to finance the equity options it has for each plant. This isn't a factoring type financing, nor is it traditional debt or equity (although it could be). It's also complicated by the international aspects. The cashflow from the "Global 2000's " purchase commitment is sufficient to generate cashflow to service the plant operations, cover the project financing and provide cashflow to the equity holders. I need to do more analysis on this. Any thoughts on financing options? What am I missing in thinking through this? What legal advice should we think about? Thanks...