I don't have a -7, nor have I built one. However, I just went through this same scenario (many times) building the aft fuse of a -12. Our -12 plans tell us where we need to 'break' the edges and on which skins, so that there isn't an unsightly gap after riveting. My .02-cents is that like someone else mentioned, the Avery edge roller is a cool little tool and works fantastic! It takes a little practice on some scrap, but then it takes very little time and effort to make a really subtle edge break/bend on the skin. If the skin you mentioned needs a little help, the edge rolling tool should work fantastic. I am also aware of another version that is supposed to work with even less effort (the vise-grip style with rollers welded on), but I already had the Avery version and it worked very nicely. If you end up doing this procedure, just be sure to not work on one little area for very long. In other words, make long sweeping motions with the edge roller as you work your way down the skin. You kind of have to keep a little angle and pressure on the tool, which is forcing the aluminum to slightly bend between the wheels as you move it along. Long sweeping motions will keep you from having a wavy edge. Don't use a lot of pressure on the tool since you only want a very subtle bend. Works great! I bet it would help too, in the situation you describe.
