If you look at the Modern-Aire site, they have several shapes where the front tapers at the top to the depth of an upper cabinet, and the sides are straight so as to butt up to, and cover, the yellow cabinet sides you mentioned. Their typical sizes are 18" and 30" high, but you could get a 24" custom one if your budget allows. Or you could get an 18" and have a box made for above it to cover that area and to which you could attach replacement moulding. The box could be made of either wood matching your moulding or sheetrock. Vent-a-hood has a stainless direct replacement if you decide to stick with the same size you now have. I'm attaching the link to the Modern-Aire page that shows their shapes. PS-10, PS-11, and PS-26 all have the characteristics I was talking about above. Here is a link that might be useful: Modern-Aire Hoods

Like Jamies, I posted about this when I was at that point in my reno. I thought the beauty of my hood would be diminished, but didn't know what to do with my crown. A complicating factor for me were the flanking windows. In the end, I let the crown die into the wall at the upper cabs near the hood. Hood speaks for itself this way. I think hoods done like this look awesome! If you really start to look around, you'll see this a lot. Another option is to do what Thynes did (don't have a pic handy) in her/his kitchen, which is to run the crown around and over the hood where it meets the ceiling.

Our situation is a little different. We are installing new cherry (light/medium stain) cabinets ceiling height with 5" crown with same finish. We intend to put 5" crown in dining area of room (kitchen/dining area is 20x12 and each are is approx. 10x12). We plan to paint dining area crown white. Both the custom cabinet rep and my son, who has many years of remodeling experience, claim this is commonly done. In fact, I have a 4' break in kitchen crown over a door that will also have the white painted crown. That seemed odd to me but both assured me this is common. I purchased raw crown from cabinet company for dining area to assure that the profile matches which is important. My son and cabinet rep had different opinions about joining the painted and stained crown. The cabinet will install the cabinets and stained crown and my son the rest of the crown. The cabinet rep suggested mitering the corners but my son said he was old school and would use coping saw to join the crown. I hope this is helpful. Best wishes

This is commercial but I could see a skylit type application making an appearance in residential. The thing I don't like about older fluorescent in general is the color rendering and the way that fluorescence flattens everything. And added that in a glow ceiling there were often shadows and dead spots which I couldn't just ignore and I find unpleasant. I also think some LED is much too cold. I don't want my indoor lighting to look like a bright sunny day, I like a lower temperature. But I can see the evenness of this working pretty well at the right light temperature.