Create me a High-level Business Case

I am wanting a High-level Business Case to be crated from a NFP to a large government organisation. This will entail costings which I have completed and summary of outcomes and impacts for linkage between the 2 x services. this is a high-level Business Case only experience writers need apply. Must be able to write tender style with demonstration of ROI and benefits. Files will be provided to the successful business case writer.