Since there are two of you who posted recently, I thought I'd mention there is a Durst RCP20 on german ebay at the moment. As I mentioned in my classified, the Durst has 3 baths instead of 2 on the Thermophot.
Technically the RCP20 is designed for an old color process, RCP, which isn't RA4. The Thermophot is designed for RA4 out of the box and has a speed switch to use a slower process. However you can google it, and find plans to convert an RCP20 to operate at RA4. I know this because I also have an RCP20 and I've begun this conversion. I hit a snag that gear with the correct teeth needed is not available from McMaster Carr, so I think I need to design and 3D print the proper gear.
Many RCP20s that are out there have already undergone this conversion, but I'm not sure if the one on german ebay has or not.