What's wrong with twincharging? Other than being insanely expensive and thoroughly impractical and the fact that you're going to have an amazingly hard time making the room... I see nothing wrong with it. It's been done with the 7M before. But for what it costs you could build a much more powerful turbo-only setup and still have cash left over for other neato goodies... 
But I don't think you're nuts.... just impractical and have unrealistic ideas of what the final product will be.
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