update (all too often people forget to post updates/solutions):
I got the digital images to Eddy Lai at AMG, so they were able to check out the damage before even seeing the car. The 190E is now in their hands with an estimated 4hrs of cutting/welding, and fortunately loss-of-use has been negated by my last-minute business trip to snowy Alberta!
Lesson Learned: keep check on rusty parts under load!
Thanks for the responses, looks like the car goes back up for sale since I spotted a few C230K/280 Sports...