In the upper RH corner I have reinforced that foot with the mat board making it very strong, you can see I have colored the white edges that will show (on the foot) with black marker but grey would have looked good as well.
The loose kit part in the middle was supposed to have run on a 45 degree angle and closed in the corner foot, I choose to leave it off (More like a Wilesco) as the mat board has really made the corner strong.
The other 3 corners need mat board yet, but I feel certain the base will still support the gallon of milk after the feet corners are all reinforced.
The little Right triangle in the very corner just helps keep the L shape corner nice and square.
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