The only thing that is scary about scarebird is the fact that the Previa won't be around on the streets for much longer, so I would stock up on rotors now for the long term.
The hub on the LBP is 2.81" nominal, the outer bearing outer race is 1.81", there is a full 1/2" of cast alloy around the bearing to support it OE. Having the hub machined
down to the SBP hub dia. of 2.31" would leave only 1/8" of material to support it......& possibly 60-70% of Your cars weight!!! DANGEROUS.........................
I'm not sure what bearings Wilwood is even using in their hubs, so that could even be worse yet!!
Having Your steelies modified can be done & safely, but screws up using them on the back if You want to rotate tires unless You use a hub ring, which a million tuners do.....
You seem insistent on putting discs on the car, and they are great to have, but I stand by what I said posts back.......for the type of driving You do just putting 10" drums
on instead will stop that little lightweight Vali perfectly fine. It probably stops fine now, if the shoes are adjusted properly & the wheel cylinders are free & working fine, the
only time they would be a problem is long steep *** mountain descents.