Patio Sliding Doors, Again

I'd asked some questions awhile back about sliding patio doors. I've decided to replace them as the local glass company wants $200.00 per side for new glass. And the new rollers and labor will be around $175.00. So $575.00 to fix the old set to me is just out of the question.
I found a nice Pella door that has argon filled glass, dead bolt lock, nice wooded interior that I can stain to match the kitchen trim for $828.00, and I have a Lowes 10% off coupon that I can use. So if I do the work myself and buy that door for $746.00 I think I'm better off.
Now to my question, this is an assembled frame that slides in place from the outside of the house. The frame unit has a fold out flange I'll call it that nails to the door opening. If you look at this link to the PDF file and look at section 3B you can see what I'm talking about. http://home.cinci.rr.com/mfgengineer/clad_sliding_patio_door.pdf
My problem is that the house has aluminum siding and is cut right at the edge of the old sliding door opening, as well is the size of the new door. So to nail that flange I would need to strip off all the siding then after the door is installed reinstall the siding. Not fun.
My only other thought is to cut the siding back to allow me to nail the flange of the door frame, and then use a brick molding to hide where I cut the siding back. Not sure I'd like how that would look.
Any ideas guys?
Thanks, Brian
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pellas have the opening screen inside, bugs will get in with that design
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