Yes and no...
Though Usul is a Goa'uld, he ascended some time ago, and previous to his ascension he had some access to ascended influenced tech through the Ascended Lord he served.
The "look" of the ships is intended to be a combination of Goa'uld and Tau'ri designs. This is because Usul spent a great deal of time studying the Tau'ri in his attempts to destroy them, ultimately this led to a modicum of respect for them and their methods.
So, inspired by tau'ri, built by Goa'uld...





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