You can see that only height and width are given for molding, because that is all builders are really concerned with. A bit of the molding face is shown to help designers.
The same procedure will work for just about anything you want to trace.
Note: This instructable is for Alibre users and assumes that you are familiar with Alibre basics. If you are not I recommend that you work through the tutorials. They are very easy to follow and will have you up to speed in no time.
Step 1: Capture the Image.
This is from Alibre Help: “Several popular file types are supported: JPG, GIF, TIF, BMP, DIB, RLE, EMF, WMF, PNG, JPE, JPEG, JFIF and TIFF. Alibre Design does not support JPEG 2000 or lossless JPEGs, as well as some types of TIFF files.”