Super way to leave the walnut proud of the cabinet. Tough to convince most people it looks better that way than flush. How did you decide to combine all those ingredients in the finish? No problem getting the Tung to combine with the poly? Or did you do it in layers? They really look great. The trim in picture frame fashion gives you a great way to add the grilles when you're ready. Parts express has good cloth for the purpose; Antique Electronic (tubesandmore.com) has vintage stuff, way cool.