I've now ordered the wood for the back, ribs and soundboard, in rosewood and spruce respectively, from the ever helpful touchstone tonewoods. I have also bought two sets of Schaller adjustable pegs. I was torn between these and the traditional ones, so I hope I chose right. The wood for the top and bottom is a bit narrower than I wanted so I'll either modify the design a bit, or put a contrasting piece of veneer down the middle.
My birthday shot by the other day, and my family bought me a couple of the Siminoff books (this one and that one). The bluegrass mandolin looks very tempting for my next choice, or will the archtop guitar win out - next decade - arrgh.