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what would be the simplest and most cost effective way to convert my b20 ef hatch into a mid-engine red?

 
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Locate a desirable mid-engine drivetrain in a complete car.
Cut the body off.
Install Civic body.

 
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serious question if you really want to do this: how much money are you willing to spend?

 
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Actually, grm motorsports magazine, 2014 challenge, another cibaru was born (civic shell in Subaru chassis) Of course, they did not ask anyone how to do it, they simply did (this thread was originally in diy section , but all that have to ask never have the guts to do it :P)