Paul is faster then I am
Here's my approach using the Dome_Dish_60 model.
A bowl is dealing with a positive and negative it takes a bit more thought and planning. Since you've created bowls using Aspire prior to the double sided feature you should have much trouble, it's the same thought process made easier.
The outside of the Dish model needs to be "X" size bigger in the XY as well as "X" higher than the inside Dish model.