Etsy Shop Listings

Ok I need your guys' help - I want to improve the way things are listed in my shop.  Right now, I have an individual listing for each size tshirt quilt with a border and then listings for each size tshirt quilt with border and sashing (see my Etsy shop link on the left to see what I'm talking about).  I am thinking about changing it so that I only list the tshirt quilt with border (standard option) in each size and then I have a separate section of the shop called "customizations" or "add-on's" or something that would include things that you could purchase with your standard quilt purchase to make it more unique.  The custom item listings would be for things like:

• Add Sashing Between Blocks - Small/Med/Large Quilts ($40)
• Add Sashing Between Blocks - Twin/Full/Queen/King Quilts ($75)
• Add Custom Quilt Pattern instead of Meandering - Small/Med/Large Quilts
• Add Custom Quilt Pattern instead of Meandering - Twin/Full/Queen/King Quilts
• Add Slip-stitched binding - Small/Med/Large Quilts
• Add Slip-stitched binding - Twin/Full/Queen/King Quilts
• Add Flannel Backing - Small/Med/Large Quilts
• Add Flannel Backing - Twin/Full/Queen/King Quilts
• Add an Appliqued Item ($5ea)

Do you think it would be clear how to purchase a standard quilt and add on sashing and a slip stitched binding?  Or should I leave it how I have it now where there are separate listings for each different item?  I think it would be easier if you could purchase the add-on's so I wouldn't have to make a custom listing for each person - you would just add each item you want to your cart and then purchase.  Let me know what you think would be the most clear way to do it!