I think most mercedes can be removed from inside the car. There are iIrc 10 mm head bolts which screw down into the floor. Push the seats forward to expose the back two bolts then forward to expose the front. A mercedes sedan seat weighs at least 50# so be prepared for that.

Good luck!

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.