I have to agree with Skip, I got a custom job from him, but am using WOF for Fett.... anyway, you need THICK like the back of a legal pad, I used priority mail envelopes glued together, formed the bucket, then resin 'glass and bondo.
So go thick and no warpage.
You can't beat the feeling of making your OWN bucket, it's really fun (time consuming, but fun)