Not a big enough hole, just enough. You can also line it with noise protection material. Others have done so. Doing it this way prevents the seal becoming warped and thereby allowing water or condensation to enter the tail lamp assembly.Putting a big enough hole in the body to access it with your hand weakens it so not doing allows a stiffer body. Also, completely sealing the trunk liner keeps noise down. In any case, I’ve changed bulbs through an access hole on some cars where you have to be a contortionist. Two screws to completely detach the light is a delight. You can take the whole thing to the bench. I much prefer it.