You bring up some excellent points, which the movie utterly fails to answer. -Yes, where the heck did Shinzon get his hands on thalaron? For that matter, where did he get B4? -Where did he get that huge ship? How could he have had it constructed right under the Romulans' noses? Who built it? The Remans? When would they have had the time, being, you know, slaves and all? I'd think the Romulans would keep records on the Remans' activities, wouldn't you? -What was the intention of the thalaron? It was obviously for Earth (which reinforces the theory that the Romulans were the ones who supplied it), but then why all of a sudden do the Romulans worry that Shinzon will destroy Earth? Isn't that, like, what they were planning all along? -Why does the Scimitar (and her Scorpion fighters) even look like it does? The Remans don't have any ships of their own, they're slaves! And if the Remans built it, what would their incentive be to make it look absolutely unlike any Romulan ship ever seen? Are the Remans ship designers when they're not hauling dilithium at the crack of their masters' whips?