I know Topre (RF) makes the PCB and the switches for the FC660C, and the individual parts are sent to Leopold China for assembly. What I don't know is if Leopold uses their own molds for the caps, or if Topre does the caps for Leopold.
Either way, one of my dream boards would be a white blank FC660C or a white blank RF 87U (mostly the Leo). As of now, only HHKB has the option for blank caps. Yes, one could cannibalize the alphas and some of the mods from a HHKB and transplant them onto the Leo or the RF, but that wouldn't get all the correct profiles and both boards would not be able to cover all the mods.
So, who else is interested in getting blank PBTs for their Topre?