If I change the module, will the size of the module be accounted for in the layout?

Yes, when changing the module to a bigger or smaller module, you can choose to "Change Module and Update Fit" to accommodate the size change. If you choose to update the existing layout, the system will remove any panels that are now falling off of the roof or covering obstructions as a result of the change.

You'll also have the option to customize how you'd like the design to change with the updated module.