Back in the early 90's, when I was in college working on my second degree, I did museum specimen preps for the biology department at UNC. I worked with Dermistid Beetles for several semesters.
If you are wanting to prep a simple skeleton for display or just to experiment, start off with a small specimen, like a mouse. A small colony of Dermistids can strip a mouse in less then a week.
You really have to keep the colonies covered, they are marvelous escape artists. Because of what they eat, dead tissue, there could be odors associated with the Dermistids. Should the colony start to run low on food, they will try to disperse, locating a new food source....they are hard to contain when they want to leave and find food.
But they do an awesome job in consuming dead tissue. They will not eat even the smallest bones.