Re: laser guide for table sae
Forgive me if I'm oversimplifying things a bit, but in the original post I thought you were going for something a bit fancier...
Anyhow, from your most recent description, could you not simply get by with a bevel gauge to set the angle. Once the angle is setup you can measure widths easily enough between the blade and your taper jig. If the angle is already known -- and you are not cutting large pieces -- my Incra miter gauge can be easily (and precisely) set to any known angle (or matched to a bevel gauge relative to the blade) and the builtin flip-stop provides a fixed reference for reapeatability. You could even use a digital protractor or machinist protractor depending on your need for accuracy. To set your taper jig to the proper bevel relative to the fence, simply set the bevel gauge to the same angle as the piece you intend to cut. Alternately, to set it relative to the blade, set the bevel gauge to the complementary angle and then set the taper jig flush against the bevel guage and fence.
Over the years I have seen a (very) few laser-equipped tablesaws -- mostly lower-end consumer grade. Unfortunately, laser guides on a tablesaw tend to be of very limited use in general practice, so they only survive for a brief time as a 'gimmick' on some consumer-based saw and then quickly die out. All the versions I have seen mount the laser onto the blade guard assembly. If you are really handly you could purchase a laser with a beam splitter (a diffraction grating to turn the dot into a line) and fashion a means to mount it to your splitter or riving knife (provided the riving knife is taller than the blade).
As for the Charles Niels jig (which was well worth the slow download to view), the only part of any complexity is bending the aluminum -- or in my area finding the 1/4" aluminum in a land of 1/8". I can attest from a good deal of experience, aluminum and brass are quite easy to mold into most any reasonable shape with a little ingenuity, a good vice, and mallet or hammer.
Like I said, if I've misunderstood what you are looking for, I apologize.
If you want to go the route of building your own laser guide:
Laser w/line adapter (splitter):
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_143845_-1
Power Supply (5V, current limited):
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_143837_-1
And mount assembly (optional):
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_143853_-1
(see photo above for mount)