Hello. Basically it will be fine but it urgent need a cover against predators.
How big and how old is your tortoise ?
How big is the enclosure ?
Think of enough shade for your tortoise when he or she is outdoors in the enclosure.
I picked one of these up as well, quite a good deal for two planters and you can configure them in different ways. I'm already thinking of picking up another box as they are quite nice and a good size.