Man, you've just got too much time on your hands!
I am lucky enough to have more time for my hobbies than most people but it's still not enough time to implement all of the ideas I come up with.
Here's the current state of the MB/GPW Grille project...
I'm making the mold master from 3/4" MDF and for that I cut a piece of MDF to fit just inside the grille shell (after removing the factory grille face from the shell). The finished grille will sit a bit behind the front of the hood just as the original MG/GPW grille does and it's perfectly flat and vertical like the original.
In these photos I'm playing with the exact position of the lights and slots; I've printed them and cut them out so they can be moved around. Their positions in these photos is pretty close to where they'll end up.
In the last photo above sitting on the floor next to the grille are mold masters I made for MB-style turn signals - when I make the grille mold I'll make molds for these; these will be covers for 2 1/2" LEDs to convert them into wartime blackout-style lights.
When I've finalized the exact positions of everything, I'll cut holes in the MDF for the slots and lights. Those holes will be smoothed and the edges will be radiused slightly as they would be if the grille were pressed from sheet metal. Then the MDF grille face will be faired into the grille shell and a smooth finish will be applied. A mold will be made over the whole assembly so the final grille face that comes out of the mold will fit exactly over a grille shell - to install the fiberglass grille face the factory face will be removed like I did with this one and the new one epoxied in place to the shell.
My plan is to have everything ready to make the mold by mid-February... I'll be alone in the house for some time then so it's a good time to make a fiberglass mess in the garage. While I've got garage set up for fiberglass I'll make the mold and the next day I'll make the first grille in that mold.