At least one vendor (PPC-Carson City) uses four 16" long dash-3 AN braided stainless flex hoses, with appropriate fittings at the hard lines and calipers. The fittings needed vary according to what calipers you run. On our car, I needed three 16" and one 18" (left rear), but I use odd rear calipers (Porsche 911 fronts).
Be careful in buying loose components to make your own ss hoses. Not all parts and hoses interchange and some of the fitting parts are brass, not stainless. I suggest staying within one brand to avoid this.