In Carol's article she said you place them on while wet, and use the same material with a bit of water (like pottery - the water makes a 'slip' material which holds the 2 pieces in place when they dry) seems totally doable!
Sharon I agree that its fun to get motivated to make something like this! And thank you for sharing this memorial, I love that we interact and touch people in ways which we never know - Carol's recipe and knowledge still being out there and inspiring people she never met is encouraging to me!
Thanks folks!