I totally agree with Dave...
Who was it that said "there is no right way to build an oven"? Plenty of wrong ways of course, where the dome falls down, the chimney doesn't draw, the oven doesn't cook etc, but as long as it works once its finished...
That and the hinge swivel for getting the dome round. Brilliant idea.
My own personal advice would be to remember to have fun making your oven... I would be the first to admit that mine is far from perfect, but man I enjoyed building it! So build to the best of your ability, be proud of your oven, and (as I just read elsewhere) embrace your cracks!
