Optimise Inverter Duty Transformer Design

I already have a full set of drawings and load calculations for an inverter-duty transformer, but the current solution is clearly over-specified. My goal is to trim material costs without compromising electrical performance, temperature rise, or compliance with the relevant IEC/IS standards... (Budget: ₹1500 - ₹12500 INR, Jobs: 3D CAD, 3D Design, 3D Modelling, AutoCAD, CAD/CAM, Design Optimization, Electrical Engineering, Mechanical Engineering, Structural Engineering)