have done some searching and will continue to do so, but if anyone has
some tips it would be greatly appreciated: I'm starting an
arts&crafts clock w/QSWO, copying from a magazine ad, and trying to
determine the cleanest way to join the face and sides. There are two
slightly-tapered (3 degrees) face pieces that form the front (in
between them is a door with the clockface attached). I've beveled the
bottom and tops of each side piece to the same degree, but in order to
avoid leaving the end grain of the face exposed, instead of butting
the face to the side I'm thinking of mitering them, but I know I need
to adust for the taper and bevel. Front view, right-hand front piece
looks like this

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the right side piece is beveled top and bottom so it can lean up and
stand flat along with the front which is straight up vertical (not
beveled on the bottom). Due to the taper, I (think) I can't just cut
the edges 45 degrees the way I could if it were two sides of a
straight up box. I've looked at some calculators and formulas and
seen things like how to figure similar cuts for sheathing the roof of
gazebo, but in those cases all the pieces lean in at the same degree.

Is this going to be too tough for my aging brain 30 years removed from
any formal math training? I could just butt-join the side to the back
of front piece and not care that the edge shows, but I'd like to have
a seamless look of the ray-flecked white oak all the way around.