OK I haven't done this, but I looked on the youtube site. 1st one you did looks good, 2nd one you did the fabric pieces were not wide enough. 3rd one fabric too wide. If I had to guess, I would say that the fabric is twice as long as it is wide. so you would have 4x8, 3x6 etc. hope this helps.
Side note: If you make flying geese using this method, make sure you have the middle fabric 1/2 inch shorter so you don't loose the point on the end.
