Thomann make it really easy to do returns, so you've only really got the hassle of sending it back if it's no good. It is a large acoustic bass case, so probably a bit bigger than the Stagg one for the Ibanez. Of course that just means it's another large case taking up space. Though maybe you could share the large case between the two bases?

Is the Pit Bull ESB-4 exactly as wide as Fender3X's latest bass?

Otherwise can you get anyone with sewing machine skills to make up a padded gig bag for you? Or maybe crochet one?