Here you go, hopefully this is what you're looking for:
http://www.newvegasnexus.com/downloads/file.php?id=39999
I tried to set up a Nexus page for this but the Nexus was being difficult about uploading the actual file for some weird reason so I just said the heck with it and upped it to Rapidshare. A few caveats on this:
- there are some minor edge alignment issues but nothing major
- some of the extra test dummy NPCs duplicate themselves on occasion for some unknown reason
- do NOT save while in the cell, it leads to corrupt save games - do any testing on a clean save and avoid saving while in the testing cell
Not sure why you'd ever need to save while in that cell but I'm sure someone would if I didn't say not to so... yeah there it is. Don't do it, you've been warned.
I also added in 2 containers, one you requested and one you didn't: one contains all the weapons in the game and the other contains 1000 rounds of all the standard ammo so you don't have to keep hitting the console to add more while doing your testing. Both containers also respawn if you somehow manage to run thru all the ammo or break your testing implements.

How to get to the cell --> you must use the console to enter the cell as there is no normal transition from the gameworld:
coc testjoshweaponsThere's no exit from the cell as well, use the console to teleport back to a standard game cell like this:
coc gsdocmitchellhouseThat's it I guess, let me know if something is wrong or if it isn't quite what you wanted and I'll see what I can do. Enjoy.
EDIT --> And of course now that I hit submit here Nexus finally decides to add the file. ::sigh::
Link changed to the Nexus page for the file.