Nice, but why did you buy those cheap plastic ones instead of a set from board member Nine8Six (Fred) like on the car in your image?
https://www.gtcollection.com/products/porsche-headlight-conversion-kits.html
http://986forum.com/forums/diy-project-guides/48169-porsche-headlight-retrofit-%5B-cad-prototyping-finish.html
From what I've read you're going to have to be doing quite a bit of dremel work to get those generic ones to fit properly. Also you might want to use gloss instead of matt black spray, if you read through the thread above there's mention of matt getting too hot in summer... though you may be ok in the UK
Also, what kind of lacquer did you use to get them looking nice? I have a set of clears that I just can't get the fine buff marks out of after I restored them, was going to try some clear coat, apparently this stuff works ok and has UV protection...
Good luck with opening them up, the ovens in the UK and Aus aren't as big as the US ones obviously, no way the light would fit in my oven. I ended up using a heat gun and it worked in the end but took ages!