You realise that you'll only be able to tint the front side windows to 15%. (for it to be legal/MOT pass). I.e. the tint only reduces the light by 15%. I imagine if you want dark smoke, this is going to be somewhat, how do you say, 'tintier' than this. The solution to this, is that people tend just to tint their rear side windows, and the rear window itself.
Personally, I reckon it looks gash when the roofs down (and the windows are up). One dark window, followed by one normal window, and no roof. Just something to consider. I only say this because I've seen it on my mates mx5. It looked piss poor. Still, only an opinion.. If your willing to give the law two fingers and go tint happy on the front windows too, I've no doubt it will look epic

Tech 1.. Old School Cool