Gordon Henderson wrote:

I suspect it's not rocket science - I can get bricks or clay and fashion
it into the corner I want to put it, just wondering if anyones actually
done it with any hints & tips..

We have two at the farm. Both were original to the house and are built
on the wall facing the access road. We're moving and rebuilding one at
present. There's more to it than slapping some clay/bricks around.

The oven itself is either a cast iron construction, which is built into
a brick framework or a turtle shaped construction in refractory brick.

Here's how to do it with refractory brick:

http://web.tiscali.it/spirbo/ilfornoalegna/

Look at "La Realizzazione" to see how to do it.

I don't think you're going to get one of the cast-iron shells in the UK
or be able to afford to import one. They make a better job IMO since
they have the doors, control of inlet and exhaust gasses and are simple
to install (place one on the reinforced concrete base then build over it
as is shown in the guide above).