No, it's a very shapely bowl. I thought stone or ceramic of some sort but a metal kadai pot would do the job. The fun will be fitting the water connectors and seals.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
If I remember, he called in Mark Gregory, an award winning garden designer and owner of Landform Consultants to run through how to install the whole thing. Although I like the idea of a Paradise Garden, I was secretly wishing Monty would not to go for the water feature. But then, some may say, why call it a paradise garden without water. It may inspire too many domestic gardens to do this sort of thing, and what a waste of electricity, in my view.
It should have had a rill to be a real Paradise garden and, having seen the wobble on those slabs under the bowl I don't think we have much to learn from Monty about successful installation.
You can get solar powered fountain pumps now Borderline.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
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This site has bowls - expensive and not quite the same as Monty's but a good start - https://www.ukwaterfeatures.com/outdoor-water-features/all-water-features/
some ideas here maybe
Wisdom is not putting it in a fruit salad.
https://www.thebestallcollection.co.uk/store/p321/Overflowing_Water_Bowl_.html
https://www.davidharber.co.uk/water/chalice.htm
http://www.lucysmith.org.uk/bowls--plinths.html
You can get solar powered fountain pumps now Borderline.