One of the slickest tools I've found lately is the power plane from Tower Hobbies. Not real cheap but not really expensive either. It's half the price of the one from Micro Mark. You can take a deep bite or a very shallow one. It's adjustable in very small increments. I wish I'd bought one sooner. Shaping a leading edge, trailing edge, wingtip or fuselage part is effortless now. Other than that they also have aluminum sanding bars that are shaped for leadng edges.