Just to stir it up some more, your rear lights are also illegal. 
Some other MK4 on Traffic cops got done for it, no working reflectors anymore.
Not hating, I'd risk it and run them personally but just a heads up.
Looking good though! 
I got pulled over and cautioned years ago for running heavily tinted lights on a mk3 fiesta xr2i. Apparently they didnt let enough light through, which was a fair comment! But hey i was 18 and we all make mistakes.
If i were going to tint those mk4 lights, i'd only tint the reverse and indicator sections. I know theyre already OE tinted but you could make them darker without upsetting anyone, plus the leaving the tail/brake sections red might break up all that black...