I would just do 1 tier w/ a fondant man jumping out... my husband would love that!
I would suggest doing a 2-layer 10" cake (that will serve 30) and like meancat suggested, make a fondant man. I would think you'd only have to make half of a body and make the icing on the cake come up around his torso so as to make it look like he's popping out of the middle.
As for pricing, charge what you would for a normal 1 tiered cake. As for the fondant man, I'm guessing you would use a 1/2 batch to 1 full batch of fondant (?) - charge based on the amount used and your time spent making the man.
Sounds like it will be a really neat cake! Good luck!
I was thinking when I first saw your picture that a stand up 2D man, made out of white chocolate would be good (think Whimsical Cake Book technique). Here's a link for what I mean. This is a link for a different themed cake, but the idea would be the same:
or pictures from their book are at: