3D Printable LED Sign File

I have a flat PNG of my design and need it converted into a clean, print-ready 3D model for an illuminated sign. The finished size is roughly 600 mm × 600 mm. PETG will be the printing material, so please keep wall thicknesses, overhangs and tolerances appropriate to that filament... (Budget: $30 - $250 USD, Jobs: 3D Animation, 3D Design, 3D Modelling, 3D Print Design, 3D Printing, 3D Rendering, CAD / SolidWorks, CAD/CAM)