This is pure speculation and an innate desire to reconcile conflicting sources whereever possible - but could the SiP picture show a Moonboat made of (magical) reeds but covered with wood for protection, and with its sails furled and masts unstepped, since it's landed?
For those who don't have SiP, Google found me a copy of the cover here
http://drosi.tuts.nu/rezension/sns_strangers_in_prax.htm
A bit fuzzy, but you should get the idea.
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