03 civic stereo replacement question

[15nissen 10+ year member]

I am looking to replace my factory headunit w/ a single din unit.

If I replace the factory headunit will I lose the use of my factory alarm?

I've seen that I have 2 options for the dash kit. Either I retain the cubbie w/ the closing door or remove that and replace with a pocket.

I want to hear the advantages between each. I want my dash to look closest to stock as possible. I'm leaning towards the factory pocket w/ door.

Any advice would be great.

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