If you want to replace the parts because they are damaged, that's one thing, but like every other post here, you contradict yourself by saying you are doing it for weight savings and balance.
I've tried to lighten up on stangnet members as for my rep has typically been that i'm harsh and straight forward (sometimes in a bad way), but god damn are you making it hard, so that's about over...
You really don't have a clue what is and isn't worthwhile or how much things cost. You have had good advice here from well seasoned members, all of which you seem to ignore. You're budget is way off, the mods you are choosing are not cost effective, you are doing them in the wrong order and you have a serious false sense of reality of what they are going to do for you and your car. Gas mileage? rollover? lol.
How do i know all this? Simple, i've been doing this a long time, and have pretty much everything you can buy.
Simply put, you are building a 20-30k car that is going to get circles run around it by guys here that put a couple thousand bucks into their car.
Honestly, you should have never made this post, because you already know exactly what you are doing.
Good luck, enjoy your build.
I'll leave you to your project.