If you had not kept your helium to yourself that hydrogen explosion wouldn't have happened!
Hiscox make a case that fits EB-0/1/3/4 shaped bodies. I used one for my EB-4L. I own several Hiscox basses for my herd - for the money, you won't get any other case that offers the same protection in such a light package. They are every bit as tough as a full ATA-spec road case.
But seriously, which Hiscox case fits the EB3? I saw models for Les Paul and SG guitars and others for Fender Basses but nothing about Gibson basses on their site.http://www.hiscoxcases.com/standardguitar_hiscox.htm#other