I did an armadillo cake back in December. It was also for a groom's cake.
My best advice would be to use the football pan as the body. I used a 4 inch round cut in half for the head. I cut it some to form the pointy nose.
I hand drew the black stripes on the back...and filled everything in with tip 5 round dots. I used grey for the body.
I made the feet and tail out of icing. To dress it up I put fruit all around the cake board.
The photo is in my pictures. 
Search the internet for some good photos of armadillos http://images.google.com/images?q=armadillo&hl=en&btnG=Search+Images
You might could do it with the football pan and a cupcake head with fondant. The colors are grey and brown.
Here are some pics from the CC gallery:
http://cakecentral.com/modules.php?name=coppermine&file=thumbnails&meta=search&type=full&search=armadillo
Maybe you could PM them for tips.
Good Luck
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