Sounds like a decent plan there. The bolts that go through the brackets in to the bushes can foul on the sill lip, so removing with the brackets in place makes sense. Dropping the back where the brakes mount onto some lumber is good, though it doesn't go down all the way to the floor when the rear suspension is removed anyway. Put a jack under the cross section at the front, remove all the bolts then lower it down from there. It's not as heavy as you'd think, so should be easy enough to manoeuvre out.