good to hear you're making progress.
Fabrication is far more cost-effective, and adaptable, for a small number of units.
Generally, in my experience, casting in aluminium is cheaper for larger production runs.
Depending on complexity, you might also produce your own patterns/moulds?
You'll need to check your costings carefully.
All the best.
You can design without engineering, but you cannot engineer without design.
Using Win 10 with Designer 2016/2017 and TurboCAD Pro. Plat. 2018/2019 + Lightworks (64-bit versions) + AnimationLab 5.2.
Windows 10 Pro 1903 (Build 18362.418) 64-bit