Spelljammer ship CR?

[Mitchellnotes]

What CR would the different spelljammer ships be? Trying to think through ship based encounter building, or how it combines with a party for encounter building. It'd be pretty awful for a high level party to fight a space kraken only to have it destroy their ship and leave them stranded.

[JackPhoenix]

Ships, not being creatures, don't have CR.

[Sigreid]

I think the CR would be set by the crew.