Rick, The seamless-ring project needn't be complicated. Using your
steel "circle-cutter" cut out your original disk, insert that into
the appropriate area to cut a smaller disk from that, leaving you
with a "washer". Anneal. Then put it on your steel ring mandrel, and
start your hammering, annealing, hammering process, until you have a
the ring you want.
Rio Grande has an excellent video on the process. It's fairly fast
and certainly simple, requiring no fancy tools.
Gary Strickland, GJG