S.H.
I've seen this display a couple of times, and I don't think that I would hesitate in taking my child, even when she was younger... However, I believe that this is very much an individual kind of question... You are the only one who knows how your children might react to something like this... If you have seen it, you know as well as I do that there is no gore and nothing really gross to be seen... It is very possible to miss the very upsetting parts of the display, without missing out on the whole thing. It is surely an opportunity to answer questions like "what's under my skin?" in a matter of fact and educational way... It's also a great opportunity, I think, to talk about the amazing design of the human body and how many parts of it work together to make it possible for us to walk, talk, hug, hold hands, think, and love!
As always, I think it is important that you empower yourself as the parent! Focus on whether or not you think this will be a growth experience for your child! If you think it will, there is nothing wrong with giving it a shot! You can certainly guage her responses when you get there and maybe show her the picture display outside the exhibit. If she seems interested, you could take her in. You and your husband would just have to be open to the flexibility driven by her. (Which means you may have driven there to enjoy the rest of the science center without seeing the body worlds display...)
The only thing I would look out for is the "I don't like it syndrome", which is something you hopefully fight hard against in teaching your kids to eat new and different foods. If you tell your child, "I don't like this but now you try it..." They aren't going to be too keen on eating it. But, if you let them make up their own minds, sometimes they'll agree with you and sometimes they won't.
I believe that is the essence of good parenting- exposing them to as much life as possible while keeping them safe, without poisoning them to things you don't care for (unless they are universally evil- like brussel sprouts and law breaking, lol).
Hopefully that made sense... It's awfully late and I should be sleeping!! :D
Huggles!!
~S.~