My 1999 Windstar has done the same thing. The cradle rusted through on the righ-rear corner. It has 96k miles on it. What a bummer.
I have access to a FREE engine cradle from a 1998 Windstar but I am unsure if it will work since 1998 was the last year of the first generation and 1999 is the first year of the second generation. I'll have to check into that but I'm skeptical.
I plan to pull the cradle this coming weekend. I'll try to post photos when I get into it.
-dougl