Could you use the same method of getting to it on XBOX? Saving , copying the save game to a USB, then putting it to your computer and uploading the code, is it possible to do it on Playstation 3
I can't personally vouch for the accuracy of this information because I don't have a PS3 to test it out on, but I read somewhere awhile back that the Xbox 360 method did not work on the PS3.
if not all PS3 users should contact the modirator on the forums asking them to put it as a plu-ing on the playstation store along with the orther mods. They should make it so you can go to a place in the wilderness and open a door to the Test Cell.
Mods don't work directly for Bethesda, so you'd be better off trying to start an email campaign to a Bethesda employee. My instinct, however, is that Bethesda would never put out an official release to allow players to get into the test cell. It's not an area that players were ever meant to see as part of the official release.