I've seen this hide at work and really like the look on it was wondering if it would make a good hide for a box turtle. The deminisons listed on the product are probably the inner dimensions as in person it's about 12x12x10.
Maybe sink it down into the substrate to bury the 'threshold'
I have made a hide for every tortoise I've had, usually out of a plastic bin w/ a lid. It'll cost you a dollar at the dollar store. Bonus, depending on growth and size of bin sometimes you can just keep making the hole bigger until they outgrow the bin. If you want aesthetics, craft the crap out of that bin