I just played around with some models.
I took a Rom TOS BOP and modified it to the shape of the previously linked-to blueprint. I then added a rather nice (EG, accurate) Miranda model and scaled it to the same size as the Rom BOP. And, to my surprise and delight, I found dorsal silhouette of the main hulls to be quite similar. Suspiciously similar.
I read from an earlier post that there was parts of the BOT episode, unseen, that the BOP was a stolen Fed ship. If so, I could see it being a Miranda prototype.
I don't really think it means much. But it's a fun speculation.
Edit: By "model" I mean to say computer 3d model.