RP: Wedding cake topper DIY????

Anyone make their own? Whats involved?

My friend is a professional artist, and for a living he makes things like tose beautiful xmas ornaments, and actually makes large models you see at malls for the holidays. I asked him if he would consider making our cake topper, and he said yes!!!

So, what kind of materials are used? He'd be baking it, I know... please help???