I think I found a photograph taken of the Stupa you worked on: The Great Stupa of Dharmakaya
Your experience at Shambala Mountain Center sounds extraordinary! I am in awe of all that you did while there.
I know my father has an interest in doing a three year retreat, but for the same reasons as you (life circumstances), who knows if and when that will happen for him. I also have an interest in doing a three year retreat, but know that I am not yet ready to do something like that. One day, I hope to do one, when I am ready.
I don't know if you are familiar with the Buddhist University being built out in Arizona, Diamond Mountain, but many of the students there are planning on going into a 3 year retreat in a little over 5 years. They have the perfect space to do that sort of retreat if you are interested: Diamond Mountain
. There is a link up in the header for the University.