Christmas Mama

I didn't end up making chili I made my first ever turkey pot pie! Maybe Chili tomorrow.
I have had this idea in my head for a few years and I'm just not sure how to do it... I think it would be really cool to have a really big nativity set - like 2-3 FEET big! I'd like to have Mary pregnant and and on Christmas eve make her tummy "normal" sized (Don't we wish it really worked like that girls?) and put a Jesus baby in the manger. I really love the idea I just can't figure out how to do it. Now that I actually have a child I want to do this even more. The only thing I can think of is paper mache. And a pregnant belly, well, velcro a seperate piece or something? hmmm there are many ways I could do this aren't there? If I ever get around to really doing it I'll post pictures. Any ideas are welcome!