Hey, just wondered. Trying to make it as close to being a Gelatinous Cube Wizard as a Gelatinous Cube would get.
I'm trying to put this together as a character in another game, and it can always be houseruled if need be, but it needn't be part of the class itself. Also, I was kind of underwhelmed by the amount of casting the character had access to compared to a Wizard of comparable level, until I realized that at the end of the day when the low-level human wizard was out of spells, he's just a scrawny guy with a a crossbow, while the low-level gelatinous cube wizard is still a gelatinous cube. Maybe with less invested in the slam attack, but hey, that's more than the wizard has.
Anyway, made those few changes, and also made some clarifications about how stub familiars differ from stub cubes. Theu don't gain HD or special abilities gained with HD, because they get familiar abilities and don't really need them since they're not meant for combat anyway. And they don't need HD since they follow familiar-rules for HP.