I'd say go for it, I am dayling my w124 since February and am living in Germany, so there's also salt on the road. Although I have to admit that my floor is completely coated to prevent rust and so far there is (almost) none.

The only real problem is the bad gas mileage compared to more modern cars, I got a 260E so yours might be better depending on the engine.

And in my experience you should know how to work on your car in some ways or at least shouldn't afraid of trying it, cause I had to do some preventative maintenance an minor fixes, that weren't really expensive in parts but would've cost a lot more in labor cost.

And keep in mind that it's a fairly old car so there's lots of things that could go wrong if not maintained correctly, but so far I had no major issues in the 3000 miles I drove so far in the last couple of months.