Jeffrey, the computer power supply is a good idea and certainly better than dropping resistors. I still like 12 volts since all my lights are hooked up to the rheostat side of several 12 volt power packs and I can brighten and dim the lights at will.
Anthony, I don't hate him for having a Yellowstone, I hate him for having a layout with broad enough curves to run one of those monsters.
DK, all that rock work is time consuming and tedious (not to mention messy) at times but it sure is coming out nice. I really like that cliff face just before the portal.