I seem to recall a figure of 21 hrs. shop time for this job in the 126 S class cars. 21 x hourly rate + evap unit + additional this and additional that and you are well into LBs 4 digit estimate. At $75 and hr. you could be looking a close to 2 grand for just the labor - everything included.

I realize yours is not a 126, but I suspect the setup is very similar.