TrimKits USA has engineered a 24" and 27" trim kit for the new Sharp 1.6 cu. ft. Stainless microwave, model # SMC1662DS
This microwave has a very similar in appearance to the older model # R426LS, and it goes well with a lot of different appliances.
Sharp doesn’t have a trim kit available, so you now can use this microwave as a built-in.
Here is the web link to the microwave trim kit planning guides: