Like others have said, this idea is great. I love less waste in the product. However the slits in the box do not fit the buckles. You need to cut them wider and taller to get this mounted.
I'd like to see this added to the acrylic itself, if possible. The boxes have a cover option already, so the cardboard isn't really adding anything if you pick it up. You can still cut the cardboard for those who don't want the acrylic cover, but adding in a slot into the covers and tracks for the bottoms would be great for keeping things together and transportable.
There's not too much to say other than these are legitimate N52 strength and just about the perfect size and hold for your average 28mm scale miniature. I had a tendency to go with larger magnets beforehand, but I'll stick with these for any 28mm (ish) infantry from now on! They fit perfectly with the troop magnets without sticking up, too.
What can I say, they stick well to the case, magnets stick to 'em, they do what they're supposed to. I combined them with layout layers, but I reckon you could free hand them quite well if you trust your spacing, because once they are on they stay on!
Functionally they are slightly thicker than third party "magnet ready" vinyl sheets I have compared these targets to, so don't go overboard with really thick magnets on the mini base. They stick well to the base and magnets stick well to them without sticking _too_ well and leaving the mini's base.
I have a bunch of armies for various games, Being able to just swap these cubes in and out easilychuck a storage pod of dice and such on top and be ready to go in a few seconds in a real gamechanger!
Humpback bundle. Each half holds exactly what is needed for an mcp roster. 4” is a must! Will buy more for 40K