i have to disagree on both the 1/4 and 3/16". because your height is the tallest dimension all the force of the liquid weight will bear down on the bottom seams. if you happen to get a bad glue joint with either the 3/16" or 1/4" you could blow out a seam. just as a precaution of a huge mess i would use 3/8" at least on two of the sides at minimum, (all sides if you can afford it) and 1/4" on the other two. technically i agree 1/4 is enough but it depends on how good you are at getting a very good glue joint. FF acrylic will be a little easier to glue though.
remember water is 8lbs a gallon. i'm guessing mineral oil is heavier. the taller the enclosure the more force is applied to the bottom.
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