Using GIMP, he adjusts the images to remove the perspective. He then brings the image into Inkscape where he can accurately scale and trace the shape. There are detailed instructions — including ...

Although, you have quite a number of output formats to saved edited AI files, like SVG, EMF, WMF, PNG, HTML, PS, PDF, POV, DXF, etc. Let us have a look at the steps to edit AI files in Inkscape.