Customizable Flip Flop V4

This is an upgraded version of https://www.thingiverse.com/thing:3157323, with different anchors to fix the strings and a patterned sole and insole.
You can change the thickness and modify the shape to match exactly your foot and preferences, change the pattern of the sole and the pattern of the insole in contact with your feet.

First you have to put a sheet of paper under your foot and with a pencil draw the contour of it and mark a few points.
You can select to show the points as in the picture attached, just set the Edit_mode parameter to 1 and you will have an idea of the points you have to measure.
Draw a horizontal line and a vertical one starting from P1. Now draw 3 horizontal lines (it is not important the vertical distance between them, just space them roughly equal).
You have now your reference points and you can fill in the parameters of the customizer, either online or, if you downloaded the file in Openscad customizer, just change them in the file itself.
All the p