That looks familiar. I've got that project on my to do list too. I have the patch panel, but have yet to put saw to car. I second the tack suggestion. Also try using wet rags to keep the metal cool. If you don't want to do it your self you could take it to a pro. You have done the time consuming part.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine