Recommendations for custom amp stands?

Jadis deserve isolation, suggest if you go with wood you add HRS grade Nimbus couplers. Better yet, use those AND a platform with constrained layer damping - example Core Audio Designs. All of my systems make use of both.

I wonder how much weight the Nimbus can handle?

It’s more about stability and enough height to get the >€%### factory feet up in the air… I use 4 on my ARC amp and 3 on phono and Line stage. On the 50# Mac I use 3 and another 4 couplers under the live edge.

You might also consider Stack Audio a UK company w a fulfillment center in USA.

Cool, thanks