I assume the trim you are speaking of is basically "L" shaped. Make a template of the opening. Then transfer this template to a piece of 3/4" plywood. Use the plywood form to shape the trim metal.
Secure the trim metal at one end and slowly work it around the plywood form.
If you have doubts about YOUR ability do do the work, take your plywood form and the trim metal to a welding shop and I'm sure the can fix you up for less than $400.00.
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Ken & Kristine
Ft. Myers, FL
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