How big are the storm spires and could they be attached to a Lyrandar airship or will I have to downsize?
Storm spires are eldritch machines, meaning their exact workings are up to the DM. Personally I'd say that there's never been a mobile one in the past, a Lyrandar artificer developing a spire that can be mounted in an airship is an interesting story.

— Keith Baker (@HellcowKeith) March 30, 2020