I have been asked to make a small outdoor pizza oven

Have seen some on the web but they are about 1000gbp

Seems a lot for a bit of fireclay

One about 30 inch diameter 18 inch high is what I have in mind

However not sure where to start.

How best to make the dome shape, whether to use small fire bricks and build
like a mini igloo, or try to make a dome shape mould and cover with 2 inch
of fireclay.

How to calculate quantity of fireclay required or where to source it are
other unknowns

Any help appreciated

Tony