hi jason,
i don't see why it won't be ok, at the worse, it will be ok for the first 3 or 4 years, we have been thinking about building larger enclosures for our bigger ones, but we did put our big male in a larger cupboard and he wouldn't come out of his hide, so we put him back in his old enclosure after a couple weeks and he went straight to his water and drank for ages, so he thinks his 4x2x2 enclosure was better, lol,
a friend has his adults in the same size as ours and his are lots bigger then ours,
so i think tthey would be ok,
cheers,
steve........