roman’s clone PCBs are available here:
front panels found here:
options there are (obviously) build your own, pay someone to build it for you (or convince them to do so out of the kindness of their hearts), or look for them on the various used synth markets.
building roman’s clones isn’t always straightforward, but it’s not too difficult if you have DIY and troubleshooting experience. sourcing parts can sometimes be difficult, and there are sometime mods that need to be implemented for the best functionality.
roman no longer builds as he’s too busy with Deckard’s Dream, and i don’t think djangosfire is building any more, but there are a few other well-regarded builders out there. samodular (formally weedywhizz) is probably the most visible/easiest to find, and is based in germany. he also sells parts and cases: