This is an extremely ambitious project, and hopefully turns out to be worthwhile. For complex/interconnected systems, building ~accurate simulations can vastly decrease the cost of decision-making, and I'm very bullish on digital twin technology, generally. Trying things out in a simulation can be a cheap way to guide more detailed engineering analysis and 'rough in' an approach.
As an example, my startup, Bractlet (bractlet.com), uses detailed, physics-based energy simulation (aka "digital energy twin") technology as a tool to optimize HVAC design and controls in large commercial buildings. I'm sure efficacy varies widely by domain, but it's worked extremely well for us so far; we typically help our customers save about 20-30% on their energy expenditures annually, and the digital twin is the bedrock of our approach.