That`s a great solution soufflé.
Although I don`t have any puzzle playground squares, the small holes on the Gabber Rex are at the top of the clip gap and not just a straight through hole, if you know what I mean. So all I can do is find something that is flat and selotape it on and hope the wee fluff doesn`t notice!
The clip holes are a bit like the ones on a ferplast duna or a savic rody. The holes where you would attach the clips onto. He`s leaning upwards and trying to chew where he smells the air where the gaps are.