Update- it’s 2 seperate pots formed to fit together and I’m assumed wired . It’s possible to make it as one but you can clearly see How he designed the curves to support the slab. Draw
It out and as I said before control the drying of any part that is Likely to dry faster than the main body.
Just thought of this and it’s going to be very wasteful unless you rehydrate clay but break the design into the minimal amount of pieces , I’d say 2, form 2 1in slabs or thicker of wedged clay, get a wood or foam triangle for the angle desired. Let them dry to leatherhard and score and attach as rectangles with the wedge supporting , weld the hell out of the connection, wrap edges in plastic and bag the whole piece. After a 2 days uncover and carve your shape , finish details with green Brillo once bone dry. The failures will be on the external edges and will be carved off . Lots
Of work and time but nothing worth having is easy.