come up with some case designs and hire a company that does injection mold stuff to make some cases.
Maybe I am over simplifying, I don't think so though.
Mold making is the part that cost $$$$$. But even getting a case design done to the point it's ready to hand over to a mold maker/Injection operation takes takes certain crafts few around here would be well versed at.
I for one could put you out a nice custom case in 3D cad exported to an STL file ready to go to a mold maker. (not that I plan to), then all you need is the $20k-$100K it would take to start "printing" cases. Concept is simple, execution... not so much.
Plaz