All hardware for the Prime_M has been ordered. Cases are currently being machined. PCBs were ordered today. I've already got all extra bits on hand, which include screws, bumpons and stabilizers.
Prime_O PCBs have been ordered. I still haven't decided if I want to have new cases machined just for the Prime_O or modify the remaining Prime_L/_R cases to work with the Prime_O PCB. I made the Prime_O just as a one-off personal project but it got more attention than anticipated. In the end I'm pretty sure I'm going to have cases made just for the Prime_O but first I have to get the Prime_M all worked out first.