I just go with n-1 honey frames in a n sized box. Not sure how many mm that turns out to be. I've seen some pretty thick natural comb so I'm sure you could go wider than n-1 if you wanted. The natural stuff I've seen had to be at least 50mm thick.
As for the brood combs, yes the 35mm spacing is the standard. However I did listen to Mr Bush and did some experimenting with 32mm brood frame spacing for my jumbo frames. It was a HUGE benefit for those large combs. The problem with 35mm spacing is the bees will build the honey at the top of the frames out deeper than they do the brood cells. So you end up with uneven combs that makes it difficult to get large combs out of a box, re-arrange them, and even pick them up! IMO, this isn't really a problem with an all medium setup, or even deeps, but when the combs start getting huge, it's a big benefit to have them all flat and 32mm space achieve that.
I run medium frame nucs and I don't alter the standard frames (35mm) since I don't think it's worth the effort in that configuration. All my jumbo frames have 32mm spacing though.