This is how I attached the modded turn signal shroud. The epoxy drys quick so mixing and putting it on is PITA. Like I said before use Auto Goop for everything it works great and give you time to fix any mistakes you might accidentally make.
Using some impact sockets to press it all together while it dries. I want the Halo and lens to dry together. The socks just act as a press. Use anything thats heavy and will keep it pressed until it drys.