Back from the blaster's on its way to my painter. Blasting revealed a few bad spots, the front crossmember was pretty rusty at the seam, and the rear valance was bad throughout. Both parts require purchase of an inner and outer piece. I have an account with the MB dealer here in Portland, my cost on the crossmember was 150, rear valance was 470. Ouch. While I'm on the subject, blasting the body shell, jambs, trunk, soft top area and engine bay was 675, dipping the doors, hood, deck lid, soft top cover and hardtop was 920. This stuff adds up but I feel like if I've come this far I might as well do it right....
2nd picture is of a squeaky clean door after being dipped in something that is probably pretty nasty.