'63 Buick. . .

 A couple of pics that I found. This on shows Dave using Sikaflex to hold the sill in place so that he can tack weld it and the Sikaflex will also seal any gaps under the sill when finished in place. You can see the holes drilled equidistance apart for the two sill panels to be spot welded together. . .

Thes two sill panels have been tack welded and Sikaflexed and are now awaiting final welding. .