I can't figure out how to use fondant without it tearing, looking lumpy, or tasting awful - so I pretty much only use buttercream. I have a wedding coming up where the bride wants a cake for 300 but is only expecting 50 guests. 
In all the posts I have read, it sounds like the only way to cover a dummy cake is with fondant. Can you cover it with buttercream? If not, can I do the real cake in buttercream and the dummies in fondant or will that be too obvious? I really wish I would have said no to this cake!
You can absolutely cover a dummy in buttercream. And no it won't be obvious.
Yep what Brandi said 
I had the same thing this week a Bride is having 50-75 but wants a big cake for looks. She said what about doing a dummie, I say You know I have to decorate the dummie just like the real ones and there will be a charge. She went with the real thing. No extra. We all want the champane on the beer budget. 
Thanks guys.
I agree that it is crazy to do a big cake like that for 50 people and I charged her. I feel real bad. ($300.00). But like you said, I still have to do all the work.
I will have to let you know how it turns out. I have never done a fake cake before mixed with real cake. Wish me luck. This one's not until August so I have time to practice! (I don't know how to post pictures or I would do that!)
Thanks again for your help/advice. I really appreciate it!
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