So I finally made it out last weekend. You guys were not kidding - the staff was super helpful and made it easy. We did a round with instruction and had a great day. We did the 10 station course and used a golf cart to make it easy getting around (save a bit of energy for shooting).
For anyone considering the same thing in a chair here are some notes
1) There are bathrooms that are big enough for you to fit in a wheelchair in the main building (don't worry about those ones you see outside with stairs).
2) You do need to be able to pop up on some small raised platforms (no bigger than 6" max I think) either on your own or with a hand from a friend
3) Getting around the course would have been challenging without the cart in my manual chair and I am pretty mobile. Mixture of gravel, wood chips and grass. Nothing terrible just be flexible
4) Have fun! I found the staff super helpful and excited to help me find what would work for me including help with choosing guns, seating position and posture (which is also dependent on the individual).
All in all, it was a great time and I cannot say enough good things about Silver Willow and the staff there. Our instructor was fantastic and we had a wonderful day. Happy to answer any questions or help out any way I can (I will just be busy over here shopping for my newest shooting sport)