Took my grinder and put a cutoff wheel on it, zipped it off in record time, then adjusted and re-welded... it turned out it was much simpler than grinding it flat.

Here are some pics of the driver's side slider without gussets and then with gussets in place. Still need to add some tube for the 'buttresses' - to help save the doors.

No gussets:


With gussets:

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K