flipping a ballsted hull and epoxy weight

Next week, weather permitting i'm going drag the hulk out to flip it
glass the bottom and "maybe" hang the keel while upside down. Since
i'm thinking about the oink way of lead pouring (bird shot and epoxy
poured into and enlarged ballast pocket (to compensate for the
epoxy's light weight. Once the epoxy shot ballast has cured i want
to cap the keel and roll the boat......can the hull/keel structure
handle the sheer forces of the roll while on the dry. I can do it
easy but it want be that gentle of an operation. I was thinking of
building a little flip crate/cradle to contain the hull while i did
the deed. Am i crazy? Should i just do it like everone else?

DonB- did you manage to squeeze all 400+ lbs in oink? How much did
you lengthen the casting? What was you epoxy to shot ratio?

How much does a gallon of epoxy and hardner weigh?

OK, Thanks again for everyone tolerating my pestering
Jason