At this time, it is possible to sell pcb's without cases.
Anyway, Purusha have design files for this thing, it will be best
way to order the cases from him instead of making your own design..
Think it will be better for you, guys, to buy complete kit.
First reason is relays, Neutric PCB connectors and MEC switches
used in this project are costly in low qty's.
Second, you have to source parts from 6-7 different places,
it means additional shiping costs.
I'll try to think on this, to offer my best.