I dunno...I've never had a problem with the PHiZZ modules falling apart. They're the sturdiest ones I know of. Do you have a differant experiance with them?
Well, PHiZZ units weren't made with heptagons in mind, which are needed to make the inside of the torus. If you use them like they were intended, though, they hold together nicely.
I've done the spheres in many differant variations, but I haven't gotten around to doing this one yet. looks like I should, this is great!