He could have designed it, and had Czerka dorks to build it, or he bought it and increased its abilities on the star forge. Jedis and Dark Jedis, including those who call themselves Dark Lords of the Sith, don't take ranks in droid construction and such. astro gate sure sure, but to take the time to build a droid?????? design maybe but build???
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tray anakin skywalker. he created threepio while on tatooine and while he was at the jedi temple he made many droids. so many (all pretty much useless) that the masters were a little annoyed.