I found it much easier to draw the curves accurately with the pounce wheel markings. I still punched tiny holes for the reference line and used a ruler to draw it in later. I guess I could have used the ruler with the pounce wheel but it seemed easier to just draw the line with a pencil. Next, I measured and drew in all the uprights and diagonals.
I also pre-bent the capstrips for this rib. Again, I used the pounce wheel to transfer the upper rib line to the 2x4 and then drew the line down a little further to account for springback. I may have overdone the overbend a little but as long as the capstrip bends in the mold without breaking, I can usually unbend it a little by hand with I load it in the jig.
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