I have no idea what happened to that program, because it sounded like one of the few things UNRWA does that was actually useful.
Now there are reports that a new commercial market is being built in Gaza out of the same kinds of materials. It is due to open in a few months.
These sorts of stories of good news from Gaza don't get mentioned in the media - because they show that Gazans can be their own agents of change, and that story contradicts the meme of Israel - and only Israel - being responsible for Gaza misery. The PA, Egypt, Hamas, and Gazans cannot be considered to have any responsibility for their own well-being.