Splinter, I'm no engineer and my slide rule is in my moth's balls, I can't vouch for the exact precision, however, I am unscientifically guessing that a 1° (or so) inaccuracy will not be significant in small pieces.
Having tried to crawl out of that corner (and stepping over those lost nuts/screws)... If one insists on perfection, consider the laser's kerf (potential source of inaccuracy). During glue up/assembly, ensure that "sides" of the mortice and tenons kiss on the same oriented long side and not twisted. This exaggerates the concept, however, it sort of demonstrates the right and the wrong method, and I hope you're not colour blind or dyslexic.
If push comes to shove, the addition of the fence's "skin" would permit shimming, however, if the wood is bowed you're snafu'ed.
********************** Thanks eRasmus.
********************** Thanks Mokey... the devil called pottz.
If your first cut is too short... Take the second cut from the longer end... LBD
