I've got this really narrow display case hanging on a strip of wall next to my bed and I've been gathering Primes to display in there, all in truck modes. Thusfar it holds Titanium War Within Prime, Titanium Rodimus Prime, and both THS Primes. To give you an indication of the size the Titaniums fit with a bit room to spare and I need to unhook the back part of THS-01 Prime to compress it just a tiny bit and make it fit. You don't really see that in practice though unless you look closely. THS-02 is in there without the trailer. The inside of the display case measures 142 mm or 5.6 inch exactly. Now I'm looking for the right Movie prime to fit in there as well. I've got my eye on the FAB version, but I think it's a tad too big.