I've spent the whole day downloading furniture and sanitaryware and trying to get them to show their shape in coarse mode. They are just not built to do that. I accept defeat. Revit has won. I wanted coarse for the grey walls of the building, showing no hatches or internal detail, but with the correct thicknesses and buildup already set up. Surely that was the whole point of Coarse. Perfect for planning. My clients can't imagine attractive furniture and sanitaryware that looks like a coarse block, in fact who can? So it looks like I will have to do the following: I will switch to medium and change my walls to wall types which have no detail, just a grey hatch, which opens up a margin of error, as the buildups will be blank. This is not helpful, as I want to be able to toggle from Planning to Building Regs, from Coarse to Medium. That was why I wanted coarse in the first place. If I am doing grey planning walls in medium mode, then I will have to change the wall type when I do building regs, which makes the whole purpose of coarse mode redundant.
If anyone reading this know of any BIM objects that are modern and attractive, which do not change to an extruded block in coarse mode, please let me know. I have found one company - Roshults - which I downloaded from Bimobject. Their stuff looks great in all modes. It's furniture for gardens. The whole library is great. But if you know of a similar company who do high end internal furniture & sanitaryware etc, which looks good in Coarse, let me know please! Thanks