One thing I'd love to see is a replacement PSU for the 128DCR. The flat 128 seems to have modern replacements, but I could not find one for the DCR.

I got a 128DCR as a thrift-shop find like 5 years ago, but it had an iffy PSU. I was lucky to find a surplus vendor with a cache of NOS units a few years ago. (If they had mentioned the word 'Commodore' on their product description, they would have likely long ago sold through, but it was mentioned on some old Amiga forum in passing) I'm sure you could bolt together two of those metal-cage SMPS units to provide the right voltages, but even a simple guide like "Buy models X and Y, and here's how you wire it to a harness" would be a useful resource.