Has this been done yet?

Has anyone a 3.5 swap in 90 max

Anything is possable with time and money. There have been a lot of people who have done the 3.0 swap into the a 3rd gen. It takes some work, a list of parts, and you have to make or have someone make custom motor mounts. The swap from the 3.0 to 3.5 in a 4th gen is much more simple then that and takes a lot less time.

As far as a 3.5 into a 3rd gen. again it is possable! With the right amount of money. However you may not find directions for it here. There are other resources out there that have diagrams for such a thing if you are really interested.