If you are interested in walking through the building of a five-string fiddle, here is a photo-essay, pretty much step-by-step, showing how I build an instrument. The “steps” are much the same, regardless of the particular instrument, though for a cello, for instance, it takes me about three times as long as to build a violin.
At any rate, here is the first such book, and, if I write another, I will post it here, as well. (I do have other books, but not about five-string fiddles.)
Thanks for looking.