Unfortunately the only other Willie Park course I've played is Olympia Fields, so I can't compare much to his other designs. But to answer a few of your questions:
BCCC is pretty big on the history. We do have the old routings and photos of the course and it's pretty dramatic how much the course had changed over the years due to situations where the greens committee chair's wife wanted more trees or a bunker here or there. So the bunker project was really both a renovation and a restoration, I would say. Many bunkers were removed (I believe the total was 8? Including all of the bunkers that surrounded the 6th hole. None of those were in the original design and they were a maintenance and playability nightmare since they sat in the lowest lying area on the course), many were shifted (best example is the bunker in front of the 5th green which now fronts more of the green, protecting the front left pin a little better and the bunker to the right of 14 green which was shifted up, allowing more of a swale front left of the green as opposed to bunker) and the remaining bunkers were all deepened and reshaped to give more of a natural, classic look. I wouldn't say that they're rugged by any means, but they flow naturally with the lay of the land. I would say it looks similar to the bunker work that was done at Belvedere in northern MI or Walnut Hills in Lansing.
As for the tree removal, I joined after the plan had been pitched and started, but I've heard the stories. We had some luck from mother nature who took out some problem trees during storms (also took out some non-problem trees that need to be replanted to restore some of the trouble to certain holes) but I think we were "lucky" in that a lot of the trees that were added over the years were just of poor quality, so making the case to remove them wasn't as hard as originally thought. Plus, we sold it in with the entirety of the restoration plan, so learning about the history of the course and having Mr Hepner explain how Willie Park intended the course to be played and how the changes that we were proposing were meant to restore and make for a better course and experience helped a lot as well.
If you're ever in the area, definitely stop by!