I love everything about this product other than it doesn’t come with a template for lining up the screw holes. These are substantial legs for a substantial bench. The slabs I was working with weighed close to 80 pounds and didn’t have straight edges so alignment was extremely difficult.
A thick plastic sheet with screw hole locations could be sticky-affixed to the legs then peeled off and applied to the bench seat and back support as a template.
It could even be sold as an optional item or separately, possibly printable at home.