my guess is that this would do more harm than good - it will paint non-evolutionists as utopian crackpots (vegan T-rex's and adam & eve)
I think you are right. They have to be very careful here not to espouse nonsensical claims or claims that can be easily ridiculed without injecting an equal amount of doubt into competing claims.
That the world is 6000 or 10000 years old is I believe based on an analysis of the ages of offspring from Adam and Eve including the ages of the first two. However, it is not known how long Adam and Eve were in Eden in their immortal state. One could make the argument that their ages at death were from the first day of banishment from immortality. For all we know they may have been in an immortal state for billions of years, if time has any meaning in that state.
The world, the heavens and all life were created in six days seems inplausible, yet what is the measure of time when traveling near the speed of light? And how much matter would be condensed from light slowing down?
These are 'eternal mysteries' and cannot ever be proven one way or another. The Christian Bible remains a work that requires 'faith' to accept, you either believe or you do not. You will never prove 'scientifically' that the Bible's explanation of creation is true or false.
It would be better for such a museum to pose questions as I have above and let young and old wrestle with the uncertainty until they accept that nothing in our science or our biblical history can be 'proven by science' with respect to creation; one must either believe or not believe.
Wouldn't "Creationist" describe you better than "non-evolutionist" or "anti-evolutionist?"
When you begin to use the labels placed on you by those who disagree with you, you have already lost.