If you have no play with the lower ball joints then just fit the lower control arms.
I have done mine in 2015 and I had no play with my ball joints. I went for the Eurocarparts Q-Drive special because I was not really fussed (this car is just used for random jobs), it was better than any broken...
Done the same technique on my Merc., however, I used a different brand of spray for the clear coat.
https://www.mbclub.co.uk/forums/bodywork/224560-my-headlight-restoration-without-polishing.html
I think it's best to replace with a refurbished one and get some money back from trading in your old one.
I have tried the rebuild method... didn't last longer.
Yeah... the supercharger is awesome, crazy fast.
Maintenance and electrical gremlins are not too bad. There were some issues when I first bought the car but I have sorted them (the internet is a powerful tool lol). Now I just fill up and drive.
Can't remember exactly when I done mine, between August-October 2016 probably.
I will take pictures of the headlights and spray can in September 2017 to keep the forum informed.