Hi, Vanny, I suggest using a dense cake so you can sculpt it – depending on the size of the actual cake, you may need to use two sheet cakes. I would do the top wings and shield in a mixture of fondant and gumpaste and airbrush them silver. I would do these ahead of time so they are completely dry.
If you are not sure, you may want to practice the sculpting on a smaller cake – just to be sure.
DJ - Fun Fiesta Cakes