RE: How do you sand the leading edge of the elevator?
About 3/4 of the way down the page is a snarky sanding block that makes sanding control surface bevels a snap. I made a couple of different lengths and use a cut 1" sanding belt for the long block. Works great.
[link=http://www.airfieldmodels.com/information_source/model_building_tools/sanding_blocks.htm]Bevel sanding block[/link]