how is it going- any signs that it's being used by a cat or cats? If not, try putting fresh or strong (a good brand) of catnip inside to lure the leery...
I'll never forget when I accompanied my friend to a wooded area behind the Christmas Tree Shop on Rt 1 (a dept. store) to put in a shelter. She put it near where the feeder puts down food. As far as anyone knows there is only one cat left but then sometimes people dump when they see a feeder so is good to keep eyes open for new ones. but anyway, she made a great styrofoam shelter from a cooler that she had sealed shut (the lid) with duct tape and cut a hole just big enough for a cat to get in and filled with hay. That thing was warm! You could put your hand in it and feel the heat without any body heat being added.
A week later, it was gone. Some employee at the store who hates the cats dumped it.
Hope you aren't running into any obstacles! let us know!