Weapons Grade has done at least one single turbo'd LS swap. It has flipped truck style headers merging with the turbo in front, like Dai Yoshihara's drift car. They also posted a pic to their IG once of a twin turbo setup with custom manifolds that was in mock up.

I was going to check into it. The car is parked for the winter so it'll probly be closer to spring before I do but other than a couple little things the car runs awesome.