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Exterior aluminum door modifications

I have an aluminum exterior door that I need modifying. It is 850w x 2250h. I cannot make the opening any taller so I need to get it cut down to 2050h. The door is single glazed. It would involve cutting down the aluminum frame and cutting down the aluminum door. The glass would also need cutting down. I can take care of the wooden part or you could do it as part of the job. I hope that someone can help me.