Yo. My 2 cents...
4WD is not mandatory, but try to have something with decent clearance. I have a friend that drove a minivan for the Lime shuttle, as well as others...
Always bring a winter bag, and bivy sack. The OBJ campsite will freeze waterbottles almost nightly in May. The days should be nice and warm though. Still bring jackets and hoodies, because it can be cold at 9,000 feet plus.
Your hit list looks good but I would add these to your list:
South Mineral Creek - road is manageable most of the way, then hike the shuttle. 3/4 mile of sick clean creeking. Plenty of other stuff to attempt. Can combine it with a day on Lime.
Crazy Woman/Canyon Creek- flows into the Upper Animas at Rockwood. Read the book, I've never caught it but I heard it's amazing.
Entire Crystal drainage!!!- You have North Fork Crystal, Mill Falls run, the Gorge (might be way high), and Yule possibility, as well as road side stuff further down into Carbondale. (The upper shit is 4WD mandatory, but if its running you'll find people to boat with)
Snow might be your biggest slow down while running shuttles since a lot of the roads will still be burried in the high country. Best way to find boating partners is mtn buzz. I'd be happy to show you down some stuff. Since you guys are coming out early I would consider some of the Front Range stuff like South Saint Vrain and Upper South Boulder Creek. Maybe North Saint Vrain too.
Sorry to ramble, will see you here. Call to boat, 303-918-7546.