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Indeed, edge-coloring can hide quite a few sins. And as Elliot noted, a light gray blends quite well with many colors. But when you use markers (particularly oil-based ones) keep in mind that they will often color the edge in a darker shade than what the pen's cap indicates. It's just the way the ink bleeds into the paper. When in doubt, experiment, but it is generally wise to go with a lighter color than what you think. And experiment first.
As far as gluing long tabs (like on long, cylindrical rocket bodies) is concerned, those are the bane of modelers everywhere. Many of us have collected a variety of rods -- dowels, brass tubing, knitting needles, etc. -- in various diameters. The key is pre-shaping, and rolling the part to a smaller diameter than what it will be when finally glued up.
The other key is practice. All of us have built plenty of models we'll never show to anyone....
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