Cowl repair

I'm sure I can handle the cowl bottom, my issues is the sheet metal on the ends of the cowl top. I'm not to brilliant in the sheet metal dept and I'm not sure how to go about working the metal that needs to be replaced when the ends are concerned due to the compound curves.

I've already welded a full replacement floor after having it blasted and coated.
trunk pan, extensions....lower quarters, doors......the list is long! I'll have replaced probably 80% + on the car by the time its completed.
there are a few pictures in my gallery
Joe