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fyi: in 1993 I wrote a huge prototype Excel 5.0/VBA solution for BHP (Australia) to model the financing of construction and operation periods of power plants where there were multiple types of lenders (international, national). It ran on Mac, and PC. While I was paid (very well) for several months, and the result met the requirements, the person who hired me, and "pushed" this project got terminated for various reasons ... and the code, afaik, gathers dust somewhere.
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot