Alright, here's the thing. It's a good idea.

BUT

This is MeeGo Harmattan, which is a mobile OS. Your design is fine when you design in your computer, but everything changes a LOT when you're designing for a specific platform. Everything including the fonts, resolution of each and every tiny element, color scheme, shapes of objects and the entire theme in general has to change.

Of course, you don't HAVE to follow it, but then it's unprofessional, doesn't go with the entire UI and in many cases, can confuses users. The N9 is a legacy product, which means it has its own design guidlines that should be followed. The entire OS was designed to be unique, well-integrated with an exceptional user interface. If you change those basic elements, it ceases to be integrated properly. For a website, or just for playing around in Photoshop, do whatever you want, since there are no restrictions, but when it comes to designing for a mobile OS, each and every step you make comes at the cost of extra coding, inefficient programming, more work for developers, loss in performance, size and a lot of other things.

Having said that, I suggest you take a look at the N9 UX Guildlines by Nokia (http://harmattan-dev.nokia.com/docs/ux/) before actually designing anything for N9. This may help you a lot in terms of actual size, placement, font, color scheme, etc.

Also, I'd advice you not to spend so much time on trying to design the UI again.. since.. if you go to page 50 of this thread (http://talk.maemo.org/showthread.php?t=84318&page=50) and go forward for around 15 pages.. you'll see everyone already discussing and designing each and every minute element in DETAIL. So what you see of the UI has actually gone through hundreds of iterations to arrive at the stage it is right now.

Sooooo..

Yes, we are free to express what we want, but Wazapp has already gone a far way to be designed from scratch again. But the good thing about open source is that if you really want something to look the way you have in mind, then design it, put it in your phone and enjoy!