I did this repair as well, replacing most of what MB had originally with similar structure as OEM. However, upon reflection, I would get rid of that stupid ledge and make it a slope to drain water and debris off, and then I would put in a couple deep drain channels so dirt does not build up there so easily. Both changes would be pretty easy to do if its all being redone anyway, and probably really cut down on rust getting started there again long term, plus be a nearly invisible change in the body.

Heres some super basic pics of what I am talking about, one on the left is the stock ledge, one on the right is the changed version

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That's a good idea... and one that I will keep in mind when I get around to this repair.

Nice use of google sketchup, btw...

Would a Mod be kind enough to move this thread over to the bodywork section?