I'd figure it it was to a fair scale for a spartan/elite figure to go inside, I think it would take the estimation of 13 or so Scarab sets to achieve. Sucker is big enough to fit a few banshees in and 3 landing pads on top. (game wise) 99.9% sure a official set of this would probably be too expensive/tasking to make to be profitable.
In terms of scale I think without legs positioned the kraken would measure about 19 Inches, (?) arguably bigger than the Infinity set is. So, I think that would mean It would have to be mega downsized in scale to be a set.
But then there is always those battle hardy veterans who dare take the challenge to make their own custom kraken. Any who do make this attempt. I salute thee.