Finished result of the slots:
Here is the bottom of the frame section with the flanges bolted on and wheels fit. To line up the flanges I lock the QR skewer axles and the axle automatically aligns the bracket. Then I can snug the bolts down.
I do need to get some washers so the bolts have a better seat than the 2 sides of the slots.
If you look close you can see a slight toe-in alignment in the tire against the frame. That was mentioned in an earlier post when I got up to that step in the frame fabrication.
