I use groupings of boxes which I size and then texture and group with the standard kitchen furniture shipped with SH3D. I can make a hole for a sink by making that part of the counter out of several boxes surrounding the hole. In my case the counter was engineered stone with the surface options all being small granular textures. I guess multiple boxes might not be a technique for textures with larger grain.

It would be useful if SH3D came with a standard set of primitive shapes, such as boxes, prisms, pyramids, and a thin walled open-top open-bottom box. It would then be easy to create a variety of counter tops, slopes, roofs, etc, without resorting to Art of Illusion or other such tools. If the sides of all primitives had a separate material that would also be very helpful (it would be easier than laminating with more boxes).

Here is a SH3D rendering of kitchen where boxes contribute to the counter-top, cabinet panelling, light fittings, cabinet handles, etc:



And then we actually constructed it:



All in all, SH3D prevented many mistakes and helped guide the whole effort as we worked our way through the entire house.