The problem I see with struts is; they would only work in one direction. The springs work in both directions. They help lift from a closed position and also help lift from a fully open position. The springs tend to become unloaded somewhere between the closed and fully open positions. That is the way I perceive the operation of them anyway.
I am in the process of getting my Wildernest re-painted. I have taken everything apart and am totally refurbishing it including a new tent. My springs are still in good condition but would be interested in a group buy if the price is reasonable.