Ok, so to align the elevator with the fuse, you pick a point in the center of the fuse, maybe the rear center of the wing saddle, and measure to the rear corners of the elevator. The distance should be exactly the same.

You can put a T-pin in the rear of the wing saddle and use a length of string as your measuring guide. Loop a piece of masking tape around the string so it's sticky but will slide if you need to move it. Put a line in the center of the tape, and use that as your guide.

These are from directions from different planes. One thing you can do is go to Tower's site and download instructions for different planes and look at them for ideas. You can also go to Aero-works.net and look at their instructions (high quality planes).