A defining aspect of layered modeling is the geometric dependence of layers on underlying layers. This is clearly evidenced in a multitude of books and tutorials on sketching and concept art [Davies and Scott 2012], where maquettes of underlying layers are used as a visual reference on and around which to draw subsequent layers (Figure 2). Prior work in sketch-based modeling [Kara and Shimada 2007; Nealen et al. 2007; Takayama et al. 2013], typically interprets sketched strokes as lying on template objects or the evolving 3D geometric skin of the object. In the context of layered modeling however, we expect that sketched strokes are largely drawn around underlying template objects, to build new layered structures.