The Tantalus isn't really a miniature, it's just a Mongoose kitbash. It was only ever available as parts on the website. I think there was a mention of an update of S&P ships in the works, so that will probably be included.
The White Star II is no longer the WSC-2. The WS and WSII now better represent what we saw in the show, ie there were obviously some that carried Nials and some that didn't.