Some of your calculations may be a little fat but never the less, the less is better. You've done more then most folks care to think about.
If you continue down the path of reduction, you may incidentally find yourself in the Micro weight neighborhood. This is where it gets silly putty pricey, but the ounces can amount to counts of pounds off.

A Duster is a great platform to start with especially with a small block. Half the battle is right there alone.
Maybe some night/day we'll meet at the hangouts with the cars and chat about kite flying.LOL.