Concealed Hinge and Locking Mechanism Redesign

I have a metal hinge that currently works well but I need one that is longer and slightly more narrow to fit a tight space. I have remodeled the components but the nature of the hinge requires precise dimensions for it to work properly... (Budget: $30 - $250 USD, Jobs: 3D Design, 3D Modelling, CAD / SolidWorks, CAD/CAM, FEA / Structural Analysis, Mechanical Engineering, Product Design, Solidworks)