Grooms Cake [also in forums]

I am surprising Jeff with a grooms cake

The first would be a 1932 Ford Sedan. It would basically be a remake of the car his father gave to him before he died (that his fathers wife sold illegally). I am thinking of making a custom car shop in the back so it looks like the ford is in the parking lot since his love of cars came from his mechanic of a father. I know this cake would make him cry at the wedding, I dont know how he feels about that

The second idea is tied in with the third. The second is basically a cake based on his favorite 360 game, the third is a Mario Brothers Cake. I might tie the last two together if thats what I choose.

The question is (and my facebook is practically split 50/50 on this) do I present this to him at our Rehearsal dinner or at the Reception next to our cake? Did you have a grooms cake? How did you present it?