Hi Marc, it can get really chockers on Ipswich Rd even after 9am, particularly between Annerley and Woolloongabba. Lots of trucks as well. So yes, I'd leave a bit earlier.
There's a restaurant at the bottom level, yummy menu but very pricey for everything. Starbucks is a very short walk down the road.
It frustrated me no end being there for the Science Festival with the family and not being able to do the NASA exhibition (well there's a good part of the day just to be spent there isn't it). There's huge panoramas of the Moon landing outside the walls of the exhibit, so I had to make do with pics pretending I was on the Moon (good at selfies?!)

. Also next to one of those panoramas there's a glass frame, step inside get someone to take a pic, it puts you on a space magazine cover, that was fun.
Anyhow, I'm yet to go inside, but I snuck my head in and omg there was the space shuttle right in front of me to the side! Tease.....!
Why Brisbane?
The exhibition opened a week ahead of the World Science Festival held here in Brisbane. So perhaps that's an added factor ?
Also thanks to funding from the government the museum was renovated so was able to accommodate it, was it done especially I don't know, I thought so

. I read somewhere an extra floor was added

.
“We had to bring a number of them in through the normal way, we’ve got a fairly big goods lift,
but we also had to crane objects to the outside and pull the wall off the museum just to get them in.”
Queensland Science Minister Leeanne Enoch said the exhibition was the first to be staged in the newly refurbished exhibition space in the museum.
“A $3.25 million investment from the Palaszczuk government to see that expansion which means not only is this now the largest exhibition the museum has ever hosted, but it gives us the opportunity to host large events in the future,” Ms Enoch said.
https://www.brisbanetimes.com.au/nat...21-p50zct.html