Not the Ulysses hull, the shape is completely wrong, the Yamato most resembles a huge version of the Excelsior hull, but stretched on the inside edge to join with the connecting hull, WZ's Relentless or Sorceror could be used as the basis of the secondary hulls, I may try that myself actually, using a scaled up and flattened version of the Ulysses saucer, the nacelles, aren't really like anything anyone else has ever done really, I suppose the Ulysses/Mars nacelles again and pylons made out of odd bits and pieces, the torpedo pods probably from WZ's Akula (for the flattened rectangualr profile they have) the only piece I can't think of is the connecting hull, though I'd be inclined to source that from the TOS one by Stresspuppy if it has one, I can't tell from the picture at the start of the thread.
Edit: for the connecting hull, just thought of it: an Okinawa hull could be used, ridiculously scaled up and retextured of course, and it'd connect perfectly to the Saucer.