It's been done before:

Going for it....V8 400CE - Benzworld.org - Mercedes-Benz Discussion Forum

I know Satish Tummala has done a lot of conversions.

Motorwerks Mercedes-Benz, BMW, AUDI* Sales and Service

He goes by the username stummala.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".