this took me 2 weeks in my sculpture class and i used about 200 bags. it's about 5 1/2 x 5 1/2 and contact cemented to an old RV outdoor rug for secure backing.
it's not very practical for cats
but if it gets dirty from being walked on, it just takes a quick wipedown
this is me with my rug at the Belles Typography Show in Midland, Mi last week.