Tell us about yourself!
This could work especially well for cats fed a raw/meat-based diet. The poo will be smaller and drier, so not very smelly and won't stick much to the gravel.
I like the use of a picture frame that may be obtained inexpensively from a department store clearance, yard sale or thrift shop in place of costly and tricky to cut trim molding.
Nice job on a first 'able.
My first fetch-kitty taught me ;-)
Soda Can Rose