i just do a offset curve on the right side i did 1.8 for the distance and i copy the outside curve and
i would do the offset again at 1.8 after that i draw a line from right to left and as you can see there is a small
problem with the offset because tey are not the same i think
i just discover its the line i draw from the first offset to the second on the left side strange??
maybe someone can explain it
after zooming nxst screen shot
and more zoom it is not much but… it can be given big problem it think on big distancing