tomthiel -
I finished up my turntable stand and am so happy with the results. I used Sherwin Williams SHER-WOOD Precat Lacquer over shellac just as you suggested. I just love the finish and the depth it gives to the Birdseye Maple, such beautiful wood. It is a bit lighter than the speakers, but fully expected that. I believe time will darken it.
I posted a picture in my virtual system page. The depth in the Birdseye maple is difficult to capture in a photograph.
Thanks again for sharing your knowledge!