Tom, with howling bearings and the presence of rust, I would check for lateral play in the shaft. If it moves side to side then you should go ahead and check the cam lobe and push rod ends as well. My cam had a groove wore into it and the pushrod ends were peened over. This was within the first few gallons of fuel with proper break in, supposedly good fuel and regular shutdown maintenance. So give it a good once over so your not tearing it down again after the new ceramic bearings are installed. One good thing about Saito service is that there is a flat $25.00 labor charge. If you need just a carb swapped out or a complete engine overhaul, same $25.00 fee + parts. On another note, if you need something less critical as bearings, for instance, engine block, manifolds, valve covers, etc they offer used parts for 20% off. It all adds up.
Gary, I've read that a good storage method is to hang the plane by its tail so the oil stays on the front bearing and seal. I don't know how that helps the rear main bearing, but who knows? Later, Joe