Hi, I have time in these forums, but I had not registered until now to comment these downloads
In the forums of Capitalsims (A spanish site) a user has created several new non-replacement objects for the game, including a new freezer, paintings and more.
These are replacement streets
He has been working directly with the code to clone objects and is doing pretty good. The freezer works fine, I was a beta-tester
These downloads come with their own installer, you just have to specify the path where The Sims 3 is installed and the package file and the resource.cfg file will be automatically installed.
If you want to download and try,
this is the link to the post