i did this modification on my g37 before, its not something hard but rather time consuming. i used the heat gun method to open up a corner of headlight and used thin metal part to keep them from closing while i worked on opening them. i dont believe you can do 5-6 cars in a day, i say 2-3 cars when you work fast. im sure the oven method can be faster than heatgun. but that is just an estimate of time by parting out the lens, and preparing them for paint, drying(i guess you can use the fast healing paint. 1 thin coat every 15min of drying time), sealing back up.
anyway, good luck with this modification. i will be doing my z headlight in chrome black this time around.
this was my car headlight @ first attempt
