You might not believe this but I'm currently working on the design of a rocket stove, which I'll be 3d modelling and printing. I've been spending the past months researching castable refractory cements, perlite insulation and stove dimensions. If you dont know, rocket stoves are super clean efficient wood burning stoves. I'm sure a griddle could be incorporated into the design.
I like your idea for interlocking terracotta tiles, it would allow the stove to expand and contract with the heat and not crack. I'm not sure about the 1kw heating element though, people who already use wood would... could continue using wood with a rocket stove, without the smoke problems of conventional stoves.
I'd love to build a vaulted ceiling one day, really beautiful, tell me more!
Oh and your link didn't work because of the full stop, took me a moment to realise, i'll post it again :)
https://steemit.com/steemit/@samether/100-steem-to-solve-a-clay-problem
Thanks for the inspiration, I'll get some stove stuff on here ASAP!