ebj3810,
I talked to his son last year and he still has Dr. Al McGraw\'s birds and was selling chicks. The silver spangled gene is still in his Manx Rumpies and had what I believe he called them Araucanas but they were probably tailed and had no muffs or beards. You may be able to create a strain of Ameraucanas from them.
I have a manx rumpie silver spangled hen right now and am trying to make some Silver Spangled rumpless/tufted Araucanas from her. I have no time or space to try the Ameraucana project at this time. They do have yellow legs so you would have to work on leg color. The genetics experts here may be able to tell you if this color is feasable with the Ameraucana standard as far as leg color. That would probably be the only hurdle needed since silver and silver spangled will give you the color and the muffs and beards should be able to be added. Good luck if this is a project you are attempting.