[Q] New rom (or just launcher)?

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http://forum.xda-developers.com – The first thing I want to say is that my English is not really good. I hope you understand my questions. I have an idea for a new Android rom, but I'm faced with a dilemma. I want to have as much as possible supported devices, so I also can just build a launcher apk which can be installed through Google Play. In this way all mobile devices with the minimal platform version can use it. The biggest problem is that I don't only want a replacement for the application launcher but also the notification drawer and everything else. Is it possible to replace them also? I don't think so, so I think I' (HowTos)