Looks great! My cousin and I ( on his chevy beretta gtz (1990)) made altezza type lights for his car and when we opened up the tail lights (just as the guy in the link you mentioned did) we noticed how much room for improvement there was on the reflectivity of the tail lights. We started putting reflective tape on it but we didn't buy really flexible tape and had to give up. This idea seems like a good one. Even better would be to see where else we could fit this reflective tape.. front parking lights? Headlights?!!
Tell me how it goes. I think of going down to the junkyard and getting the taillights off of another '87 bonnie they got down there.