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I figured out the dimensions of at least one side using the capybara as a measuring unit. A capybara grows on average to 106-134 cm, so I averaged that to get a length of 120cm. From there I used the capybara units to approximate the length and height of the side wall (behind wall behind the character).
Length = 326.57cm
Height = 153.74cm
It's hard to determine the width since it's unknown how far away the camera is from the side. Somebody might make use of the info, though. The room seems quite small however, so I'm not sure if you could blow up the wall without damaging yourself.