I second the vote for the screw on metal seam guide. Your FW will have a hole for one just as my 301s do. I can't sew a decent straight seam without it. I will use the 1/4 foot on my next quilt because it will have curved seams. Your strip looks good. Just be sure to match the corners when you sew the next strip to that one.
April1930sshoppe has everything you need for a FW.