Brazilian cherry is a little like mohagony - beautiful. I can't imagine it being "too much" with similar trim - it would look extremely rich and elegant and my suggestion would be to leave the dark trim because the BC will get quite dark with time. I just spent several years stripping off all the paint from my trim so I could get back to the original dark wood. It's beautiful and if still in good shape, may end up increasing the value of your house. I couldn't figure out what trim to use when I was restoring the house. I wanted to use as much of the original as possible - most probably birch stained to look like mohogany, which was common in the NE back in the 1800s. I put in a rosewood floor but couldn't find original baseboards. I ended up buying mohagany and staining that to match. But the rest of the trim now matches the baseboards and looks great. The more wood, the better, IMO. But I have a Mission Style house and that may not appeal to you. It is what people first notice however, and why I bought the house. In another room, because the floor wood is purple, I couldn't think of a way to match it and didn't want to have custom purpleheart moldings made. Since the walls were a kind of pink, I took a vert little bit of that and mixed into a bright white gloss, softening it, and then used that for the trim. That tied everything together. I still have one room to finish and it has a BC floor. I will probably use the mohogany trim there because I can't imagine contrasting with the BC floor, which has now become quite dark. Cabins generally have something like knotty pine. You have something quite different. Put in some nice area rugs, some nice lamps, and see how warm and wonderful your home is!

Here's the trim I did for my kitchen. Google craftsman style trim for the pictures. Here is a link that might be useful: craftsman style trim

I like baseboards larger than door and window casings. On door casings, I like your idea of same design/different width casings. Except maintain consistency like all doors in the old part of the house have the same narrower width casing. You don't want to look down a hallway, for example, and see different width casings on some than on others.

I like the way this house is finished with simple cove crown molding. I like that the molding is white, but the door is stained wood. Where the ceiling is slanted they omitted the crown molding; much cleaner look for that area. The base molding is quite generous.