Listen to Dan mate he knows his stuff!!
I don't think it is as bad as you think it is tbh!
Like dan said about the brakes, they should be fine now so leave the hand brake cable, the PAS noise is normal so ignore that
Hitting 90 and going flat...airbox! Or as it has been sitting a while (callipers seized) it may just need a few runs to clear the crap!
And 1) could be your pulleys although, mine need replacing and mine squeak! (Although never do it when you are trying to show someone -_-)
If you get down to the fords parts desk, tell them you need the screw that holds in the wing mirror, they will bring an exploded diagram up and you can point to the exact one you need and they can go get it/order it in.
The ST can be tail happy in the corners but shouldn't wobble, sounds like either a buckled wheel or tracking, get the tracking done and the wheels rebalanced :thumbs: