well i bit the bullet today, got the car straight in after work, id bin reading up on how other people have filled holes on metal work... i cut some small metal squares and held then in place with a magnet then tacked them, did all 4 at the same time doing a little welding to each and cooling them down with water spray, this way it avoided putting to much heat on any one hole for to long, and im pleased to say it turned out perfectly! im really pleased with it, you would never know there was a hole there, and the boot didnt warp, it only took me an hour to do all 4 from start to finish, there all ground back and painted so they dont rust, just need a skim of filler then paint the boot lid and fit my spoiler.
so glad i did this myself, not only from the satisfaction of DIY but that no body shop wanted to do it for me, so now its done properly and saved me some money, not going to attempt the painting tho lol
gonna get it in tomorrow and do the same to the wiper hole! shame i never got any pics, im not a pro with body work everything i do is self taught after a bit of research, proof that any idiot can do it if they try lol