I really like the half case design.
As for a production run, I am not planning on doing a production run myself, but if @XEMON wishes to do so then I am fully behind that as he has been a great help in testing and he has designed the case(s). Software issues can be reported to me here or through the GitHub.
As the hardware is just a Trinket M0 and an RC522 another possibility is that some people might like the encased hardware for other software that they are working on. xM1 unlock block 0 @cells-called-nick would you be interested in this case design?