So I'm bringing some standard sheet metal designs into Solidworks.  Al have the same dish drain setup on the left, a backsplash, and a rolled semi circular edge.  Some are long, some are short, some have sinks.  No problems there.  BUT, some are L-shaped, and some have the rolled edge or backsplash extend onto different sides.  Ideas for best practices in modeling these? 

I'm starting off the left side, as it's the same on all of them.  From there I plan to add features via configurations for the different types.

And there is a 1/8" per foot slope towards the left side...

Example of one type fully modeled uploaded.