I'm considering installing the kitchen sink as an undermount instead
of top mount.

If you don't want to read the rest, the main question is, are there
any drawbacks, or "oops" that I'm not thinking of that are gonna get
me in trouble mid way (or worse) thru the project?


Besides being a cleaner look, there are other advantages.

The clips are able to handle but so thick a material and ply + cement
backerboard board + granite tile are too much for 'em.

Trying to clip only to the tile concerns me.

My plan (at the moment) is to secure the sink to the ply base, run the
backerboard to the sink lip (but not over it) and then overlap the
tile on top of the sink lip to the edge.
Not sure how the thinset will be handled at the sink edge. Grout?

Thanx
Renata