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Where should the sill trim end at the side casing?
A projecting window stool gives the sill a ledge, while casing that turns around a flush lower edge can look neater. I’m curious how you choose between those details when the side casing needs to meet the sill cleanly.
If there’s already a stool, do you usually keep its projection and fit the casing to it, or is there a good reason to carry the casing around the sill instead? I’d also like to know what you measure at the wall and nearby baseboard before cutting, so the lower trim doesn’t end up looking cramped or awkward.
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The wall-to-baseboard clearance is worth checking with the trim mocked up, not just measured from the bare wall. Hold the stool and side casing at their intended projections, then see how much room remains for the lower ends to finish cleanly. If there’s no comfortable space for a termination or transition piece, adjust the layout before cutting; the stool’s projection can make an otherwise balanced detail feel cramped.