Progress on new sill replacement
The new channel wings didn't line up perfectly, and I had to grind a bit off the passenger side and do some creative tacking to get everything to line up as good as possible.
For the new fender pieces, I traced the existing cutout section onto a piece of paper, then traced that onto cardboard, and then finally onto the sheet metal. I got pretty close with the cuts, but tried to error on the side of too big whenever necessary. I added some holes in the center of each piece to weld the new sections to the CCOT channel.
The 16g bends pretty easily with some clamps, and I tried to start at one end and work my way to the other. To try and control the heat and warping, I just did a series of tacks all along the seam, starting with 2" (or more) gaps, then filling in the spaces. I drilled holes in the custom pieces, and tried rosette welds through to the channel wings.
Driver's side in the middle of tacking it in. I had a bit of trouble getting good welds without burning through.
Passenger side tacked in. Welding got better on this side.
And welds ground down
So far I'm happy with how things are coming together, especially for a first-time welder. Next up I'm going to fill in the remaining holes with Duraglass and/or seam sealer, then cover it with some filler to smooth everything out.