^^ CC, same here... 5 total, but likely to build one. All are sealed for the long-haul- can't wait to see this sets progress as scarcity sets in and the new movies roll out.
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Edit: ... though I have to wonder about the science behind a "super star destroyer". I need to brush up on some Hawkins, but aren't stars basically just massive, flaming balls of hydrogen fuel?
How would you "destroy one", and...
If you were in the midst of an inter-galactic war, what would be the benefit of doing so?
SSD Crewman: "Sir, we are being attacked by an enormous fleet of X-wings and other Republic gunships. Need your orders, sir".
SSD Captain: Never mind them. See that star over there? Let's blow it up.
SSD Crewman: "Sir, our vessel has taken over 4,000 direct hits in the last twenty seconds. I advise we use our guns to fight these guys instead".
SSD Captain: YOUR INSOLENCE WILL NOT BE TOLERATED.
SSD Crewman: Sir, that star hasn't fired anything at all at us. The way I see it- and I may be alone here- is that it's just a star, and is not posing a direct threat to our mission or campaign. Those X-wings, on the other hand, have now killed over 11,000 crewman and Stormtroopers since we started this discussion. They may be faceless people to you, sir, but seven of those Stormtroopers (Randy, Hal, Alice, Tom, Angela, Stephen and Bob) are part of our Thursday-night Baccarat club. They are people, sir. Tom's kid plays soccer with yours, Sir, and I just feel that...
AAAAND KABLOOOOIE.
With the cost, labor, time, effort, and engineering prowess needed to design a ship that can blow up a star, imagine if that had all been put into a ship that blew up OTHER ships, instead of stars.
I think the Empire's engineer that built this one is the same guy who built the Death Star, and decided it would be a great idea to have a couple completely open, unexposed shafts leading to the very heart of the entire contraption- where an accurately-placed rock from a sling-shot would destroy the entire thing.