I use local Eucalypts on the majority of my mandolins. The mixture of stripe and fiddleback creates a look that I hope will raise the status of this undervalued timber.
On the left is a curved laminated back, but below is another design I call a "turtle back". I bend the sides on an iron, join them together and reinforce the center join so that it doesn't vibrate. Aside from less weight, I can't find much difference between the two except that I currently like the turtle back for the unusual look.