Thread split into two replys, 1 and 2:
1) it doesn't look too bad in the picture. Any dent isn't fun to repair but that area can be fixed using a lower repair section. It looks like it missed the rear bumper and your all red tail light.
I imagine it probably bent the floor section inside of the trunk but that should fixable.
2) I have all three cars here right now. The 300SE ssedan RHD, a 1968 600 SWB, and a 300SEL with the 2.8 engine as a parts car. THe 300SE Cab would be a very rare car.
I worked on a Detroit area 300SEL with the 189 engine once. Perfect example with about 40,000 miles on it.