Kursad Karatas shares an Addon he created for blender, which will allow you to edit your models and meshes with a lattice object easily. the Quick Lattice Editing Addon for blender will create a Lattice Object, the associated Lattice Deformer, and the necessary associated temporary selection weight group.

this addon creates a lattice and lets you edit your meshes with the lattice quickly

Simply select vertices in edit mode, call the addon by pressing the space bar and typing “easy” and selecting the addon in the list. Quick Lattice Editing Addon will also work with full selection mode for a lattice that covers the entire object. Check out the Quick Lattice Editing Addon for blender here, with a provided download link and some more information on its use.