Worst/most insane idea for a modification?

[mgrinshpon]

What's the most absolutely bat**** insane idea any of you have ever had for doing to a car?

I was looking at GM bellhousing patterns to do an unwise engine swap into a '55 Chevy Bel Air when I noticed that Cadillac Northstar V8s have the same pattern (or at least can be fit) as the transaxle on a Pontiac G6. With 8.8 liters and 16 cylinders and 4WD, what could go wrong? I'd simply move the gas tank(s)/fuel cells to the rear seat location and get some slightly modified springs to handle a bit better, plus some heavy fabrication of the steering column and frame and another radiator sucking air in from some vents that'll have to be put in the side through the use of fiberglass body panels and oh god, this'll never work on my budget. However, it could if someone would be willing to sink the money and time into it. Obviously the rear suspension would have to be redesigned so it doesn't have an attachment for a steering thing on it but all in all, it could work, and well.