C. gracilis are a nice species :-)
I split an aquarium with a piece of acrylic so that it could hold two scorpions, an O. glabrifrons and a N. hierichonticus. I did a really crap job of siliconing in the acrylic and the Nebo ended up climbing over the partition, having probably used all the lumps and bumps I made in the silicone as climbing holds. Luckily the two didn't harm each other but the chuffin Nebo escape not long after and is probably still wandering around the house!!
Anyway, if you fit the partitions so that the surface is too smooth for the scorpions to climb you should be fine with the one big lid. As an extra precaution you could put some vaseline around to tops of the compartments.