I put some acetone above each seam for every other shelf, let it sit and then pried them off. The surface is all messed up, but that's just a result of the plastic welding they used to put them on originally. I'm going to take some poster board and/or vinyl and recover the whole thing anyway. Some portables are on the white side while a lot are black, so I'm thinking a nice, neutral gray or silver. I've still got a million feet of silver vinyl lying around. You'll note I took the mirrors and topper off.... The thing is the display was so old the double sided tape (which is usually clear) had yellowed, and since you can see that inside the case it needed to be re-applied. I'm thinking of screwing it to those tabs on the top anyway.... it'd make it easier to take apart for cleaning. I threw up my game gear, a 2ds and a tablet just as an example, but I think I could put a dmg Gameboy a gbc and some of those taller cousins on there pretty well.
It cleaned up good and I now know that I can take shelves off with a little elbow grease. I'm seriously considering getting more now. They have some of the 6 sided ones as well, but I don't know if the backs come off of those.