I believe your right lets see the dimensions of the Slim are 11.42 x 2.56 x 11.42 in. plus add another 8" for the extender (guessing here) and it seems it would be a tight fit. Now factor in a least 4" on each side so the PS3 can breath and yeah the standard self won't have enough room. The price IMO is on the high side for some storage, 2 usb ports and a memory card reader if it was from $30-$40 then maybe I could consider picking one up to test.