May be it is just the matter to compose a few good HOW-TOs. What I gave up on once was creating slabs with rounded edges. Basically imagine a slab which looks like an iPhone icon: you have in the plane of the slab rather a large corner radius, but for rounding the edges of the resulting slab, a much smaller one.
Writing now about it, I think I could do it with a torus, where the radius of its cross section is the small radius, the torus radius is the large one, take two of them, add two cylinders to only keep one quarter edge and then take a quarter of the resulting bevelled disk.
Writing now about it, I think I could do it with a torus, where the radius of its cross section is the small radius, the torus radius is the large one, take two of them, add two cylinders to only keep one quarter edge and then take a quarter of the resulting bevelled disk.