I am building a cabinet that is way too big for my clamps, and doesn't have
parallel sides anyhow; so gluing the shelves in dados would be difficult.

When assembling the shelves, I would like to put in a few biscuits to make
sure the alignment is correct, and use pocket screws to actually hold it
together. I have had problems in the past getting things perfectly even
with just pocket screws, but the biscuits ought to fix that.

Any reason this is a bad idea? (other than the obvious one that pocket
screws are inherently improper)