It's really well done and the dialogue is well written, I'm not sure about the accent though.

You have to watch out that you don't replace one offensive ethnic stereotype with another (though it could be the shock of the new).

Try it straight, without any accent but with the same delivery and I might begin to love the Gungan and miss him in the other prequels (now that would be a miracle).

I don't know if you have seen the Slumberland edits but combining those edits with your re-dub and you'll have a really watchable Jar-Jar.