Thanks for all the comments everyone!
Did someone say rivets!
Okay completed balloon got a spray coat of black so I could see where to clean up excess glue and 'grout' from the panels then after that the adding of rivets began.
Now I was thinking 6 rivets a panel oh no that was way to few here's the breakdown:
32 panels of 10 rivets
16 panels of 7 rivets
16 panels of 5 rivets
512 rivets

I'll say it again...Awww man!
Current rivet progress...where's Rosie when you need her!


Cheers!