Hello Ice - I know its sometime since your original post but I just spotted it on my first visit to design & construction looking for ideas for fruit cages.
Being a little obsessed with wood, fire, & bread, I felt compelled to reply, so to cut a very long story short, (ish) in April 07 after a quadruple heart bypass I had a bit of time on my hands whilst recuperating.
During my rehab I made a few resolutions including applying for an allotment and treating myself to a wood burning pizza oven as soon as I was back on my feet, so I set about searching the net for suppliers and/or plans to self build.
I soon realised a pre made oven was out of the question, (far too expensive), so that left self build but most plans I found seemed to be too complex for me, although I am quite handy I'm no builder. Then I discovered what for me at the time was a life changing book by Kiko Denzer - 'Build your own earth oven', which is a low cost oven made of....well basically earth. I read and re-read it from cover to cover and encouraged by the author to get stuck rather than worrying about making mistakes by July I was ready to go.
Apart from some dense, (heavy), firebricks which I was fortunate to have donated, (but can be bought for approx £2 each), the oven can be made from scrap bricks, empty wine bottles sand and sawdust, plus clay dug from the garden - the only time I've been glad we have heavy clay soil. The skill required is well within the capabilities of your standard allotment holder, (although I wasn't at the time!).
Three years down the line the oven is still going strong and as I opted to insulate, (with clay and sawdust), it can cope with bread and slow roast joints as well as pizza. I keep promising to build a better model but to be honest it works so well and apart from the odd repair, (with clay of course), the only reason I'm considering it is that I enjoyed building it so much.
So my advise to anyone considering a wood burning oven but don't want to fork out hundreds or thousands of pounds and don't mind a bit of work - try this route!
I tried to attach pic but don't really know what I'm doing yet and lost my 1st attempted reply.