I'd like to say DIY ovens are hard; don't even attempt it :) but if you are interested in really good pizza, pita, bagels, and ciabatta all you need is a conventional oven modded basically like this[0]. Also a baking stone is required. SV takes too long, is it worth it?
[0] http://www.instructables.com/id/Hack-a-Toaster-Oven-for-Refl...