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If it doesn't appear in a unified perspective, it won't affect much, but it is recommended to try to be as uniform as possible.
First of all, I don't know anything about decorating. I am a material professional, only from the material analysis, if you do not consider the cost, should be titanium alloy, anti-corrosion performance is better than aluminum titanium alloy; On the other hand, aluminum-titanium alloy should be cheaper, lighter, and slightly less anti-corrosion.
Our home also packs the inner door cover, so good-looking, no inner door cover looks weird, and can protect the corner!
The metal door frame will not be deformed, but the appearance of the exposed seam will affect the appearance, and it is still necessary to deal with it.
About 700 yuan per square meter. I hope my answer can help you.
If there is a problem with the verticality, it can be adjusted. Explain your specific situation, or give a picture to see and help you.