Are there any ideas for re purposing a large stainless steel gas grill

You could turn it into an elevated garden, filling it with pots or with soil and plants. Just make sure the water has a good way out for drainage. You could make it into a server for outside that will protect the food from flies. Maybe even into a cooler.

My client sure recycled quite a few

This site may help you, has 13 different ways to repurpose

www.pinterest.com/debra_b_thomas/repurposed-grill/?lp=true

With a hole in the bottom it could be used as a fire pit.

https://www.hometalk.com/diy/build/fire-pits/charcoal-grill-fire-pit-37769804?r=2

I was thinking of using an old one as a compost bin. Lining the inside with a rubber mat and tossing my kitchen scraps in it. It would look like a grill so not offensive to the neighbors and I could move it around so it would stay in full sun.