Thanks guys. I'm pretty pleased with how it turned out. My main goals were to have the wiring solid with everything properly grounded and humm/buzz free, keep the rumble to a minimum, and make it look presentable enough for it to come up out of the basement, so I'm feeling good on all points.
Next project may be a DIY Step Up Transformer so I can consider a Denon 103 on this thing. Will need to dig into some researching what that would require. But, the Shure really does sound quite good as is.