This will help you solidify your model, plot a proper timeline and establish expectations for participation by your enlisted experts and others. General pleas for interdepartmental assistance usually don't work. So, be specific. Analyze the financial aspects. Your company's goal is productivity.
Quality is requisite to productivity.
But management is likely to focus first on the anticipated financial ROI, i.e., cost savings and income improvements. So, paint the big picture, structure the outline, and then detail it. Figure 1 shows these assumptions. There are no secret methods involved here, simply carefully detailed research. Ask your finance team member about an acceptable depreciation model for your project.