Yes, i think its about time someone came up with a decent brake upgrade for the early corollas,
because parts interchangeability isnt that easy, yet they share the same hub.
so the upgrade would be suitable for ke10-ke70.
i would say that rotor size would depend on what could be adapted, but a vented disc from say 250mm- 270 odd mm would be good, id like to be able to fit the brakes under 14" rims.
and probably just use a commodore caliper, since they are cheap, light and you can get a range of brake pads for them.